https://hex-rays.com/products/ida/news/8_3/

IDA Teams and Lumina

lumina: add a UI action to inspect a function's metadata history
lumina: allow specifying up to two Lumina servers (public or private, in any order)
lumina: metadata history can now be browsed on private Lumina servers
Teams: use licenses from vault server on IDA side (no more need for ida.key files on the client)

Procesor modules

ARM: ARM64 system registers are now displayed using symbolic names
ARM: set offsets/xrefs for LDRD/STRD if the base register is known
Dalvik: support for const-method-handle and const-method-type bytecode instructions (DEX 039/Android 10)
MIPS: improved analysis of functions with large stack frames for MIPS16
MIPS: improved the regtracker
PPC: added Power ISA 3.0C Ultravisor-related instructions
PPC: support LSP (Lightweight Signal Processing) extension instructions, available in some MPC57xx cores
PPC: support Power ISA 3.1, including prefixed instructions
RISCV: register tracker can now be configured via settings in ida.cfg

File formats

DEX: annotate hidden API section (DEX 039)
ELF: ppc: parse and use .gnu.attributes and .PPC.EMB.apuinfo sections to detect the used ISA extension
ESP: new loader for the Espressif images, supporting images from ESP8266 (Xtensa) to ESP32-C6 (RISC-V)

FLIRT / TILS / IDS

TIL: added type library for Android ARM64
TIL: suppport attribute((flag_enum)) or __bitmask attribute on enums

Standard plugins

DWARF: improve handling of unsigned 'char' types; now they're mapped to 'char' on IDA's side (instead of 'unsigned __int8')
DWARF: significantly speed up importing of type information
golang: added "detect and parse golang metadata" command
golang: annotate funcInfo's funcFlag field
golang: handle different functions with the same name in pclntab
golang: use full package prefix for functions dirtree
goomba: new plugin for optimizing mixed boolean expressions (MBA) in pseudocode
idaclang: added presets of predefined arguments for common platforms
idaclang: updated libclang to 16.0.0
OBJC: set prototypes for some widely used objc methods (e.g. objc_alloc_init)
OBJC: support iOS16 optimized objc_retain_xY/objc_release_xY stubs
OBJC: support objc_msgSend$... stubs

Kernel/Misc

installer: Missing dependencies on Linux are now checked and reported at install time
kernel: properly support operand types for 3rd to 8th operands
licensing: the EULA has been updated and unified across all IDA editions and license types
network: added ability to use an HTTP CONNECT-style proxy
network: added support for HTTP CONNECT proxy basic authentication

Scripting & SDK

IDAPython: added an example showing how to paint over an existing graph's edges
IDAPython: added support for Python 3.12
IDAPython: enable access to the global debug variable+
IDAPython: improve doc for str2ea (use text from the SDK header)
SDK/Python: added get_config_value for retrieving arbitrary JSON values in config files
SDK/Python: notepad APIs (get_ida_notepad_text/set_ida_notepad_text) now synchronize the database/UI state
SDK/UI: added ability to dynamically change values in combobox in forms
SDK: added functions validate_idb(), move_privrange()
SDK: added methods edit_named_type_details()/edit_numbered_type_details() to edit local type enum/udt details
SDK: added parse_decl_ex()

UI

UI: "Color instruction" action now also colorizes undefined items in the selection (previously they were skipped)
UI: Added support for Unicode 15.0, now more string literals are detected and displayed correctly
UI: allow editing struct.enum comments in the type editor
UI: during autoanalysis, mark choosers with a filter and/or sorting as outdated instead of updating immediately
UI: improved performance for refreshing choosers when there is no sorting or filtering
UI: provide the ability to specify icons for actions through CSS themes
UI: show comments for strlits or mangled names on each member of a string array in the disassembly listing
UI: the graph options are now saved in the desktop
UI: teams: Allow picking a chunk to use from the context menu in addition to the toolbar button/hotkey
UI: teams: save desktop layout in the database using user's name so that each user's desktop is not overridden by others

Decompilers

decompiler: added a new API function change_hexrays_config() to update the hexrays configuration, e.g. to set the analysis options or disable warnings after IDA start
decompiler: added the option to disable some optimizations
decompiler: arm: detect usage of X8 for reurning structures on ARM64 and add a hidden 'retptr' argument when callee prototypes is guessed by IDA
decompiler: enable IDAPython API for the cloud decompiler (IDA Home, IDA Educational)
decompiler: exported set_lvar_name() which can be used to rename local variables
decompiler: improve callee type guessing (detect arguments passed by reference)
decompiler: improve fastcall/thiscall calee detection
decompiler: improved guessing of call types (detect more fastcall/thiscall calls without stack arguments)
decompiler: improved propagation of zero values

Bugfixes

BUGFIX: decompiler: assignment to a stack variable used by reference in a syscall could be erroneously removed
BUGFIX: decompiler: corrupted info in the database could lead to crashes during decompilation
BUGFIX: decompiler: decompiler could cause IDA to crash if an error happened during plugin initialization
BUGFIX: decompiler: fixed a crash that could occur when deleting a function in the presence of outlined functions
BUGFIX: decompiler: fixed numerous interrs
BUGFIX: decompiler: indirect jumps in outlined code were handled incorrectly
BUGFIX: decompiler: jumps to outlined functions were handled incorrectly
BUGFIX: decompiler: the "select union member" action (Alt-Y) could fail in some cases
BUGFIX: ELF: Android ARM64 JNI files would incorrectly use 32-bit type library
BUGFIX: formatting golang metadata could fail for some 64-bit binaries if they used addresses above 32-bit address space
BUGFIX: IDA on Linux would not start if libsecret-1 or libglib-2.0 were not present
BUGFIX: idapyswitch would accept buggy Anaconda 2022 distributions which would later cause IDA to crash
BUGFIX: IDAPython: ida_dbg.get_dbg_byte() was not usable
BUGFIX: IDAPython: non-modal Python forms (using class Form) could cause crashes on the ARM macOS build of IDA
BUGFIX: IDAPython: the bookmarks_t object was not usable from IDAPython
BUGFIX: kernel: fixed printing of opcode bytes for processors which use two-byte grouping (PR_WORD_INS flag)
BUGFIX: kernel: idat64 would try to load picture_search plugin, although it only works in GUI version
BUGFIX: Lumina: fixed interr 1512 which could occur on wrong directives in lumina.conf
BUGFIX: MACHO: IDA 8.2 would fail to recover tagged pointers in arm64e dyld caches
BUGFIX: MACHO: iOS16+ branch mappings/stubs regions were not loaded in "complete" and "dependencies" modes, leading to missing symbols
BUGFIX: MACHO: when loading a complete dyld cache for iOS16, authenticated pointers would retain tagged values
BUGFIX: MIPS: TX19A-only MIPS16 BAL does not have a delay slot
BUGFIX: PDB: IDA would fail to load PDBs with page size 8192 (e.g. from recent Chrome builds)
BUGFIX: PE: Load Config Directory comments for ProcessHeapFlags and ProcessAffinityMask fields were swapped in 32-bit files
BUGFIX: PE: some files using EH4 metadata (__CxxFrameHandler4) could produce bogus "DATABASE IS CORRUPTED" warnings on load
BUGFIX: Teams: IDA would crash silently on start if the license was expired but within the grace period
BUGFIX: teams: IDA would sometime fail to save the login credentials
BUGFIX: Teams: Vault server no longer refuses to work when there are not enough licenses
BUGFIX: ui/qt: get_viewer_graph wouldn't return the mutable_graph_t instance for proximity views
BUGFIX: UI: binary search with selection would fail if cursor was at the end of selection
BUGFIX: UI: fixed an accelerator clash in the Cross-references tab of the Options dialog box
BUGFIX: UI: graph printing did not work on Windows and macOS
BUGFIX: UI: license agreement dialog was mis-interpreting UTF-8 text for Latin-1
BUGFIX: UI: renaming a structure (or an enum) from the listing, could result in the left-hand list being outdated
BUGFIX: UI: some of the search actions were not respecting user selection