My biggest question with nintendo online is, are there individual save states for these gba games? Also do you lose your save data if you quit paying for nintendo online
Looking at the main Nintendo (Japan) channel, the Japanese GBA is getting both Blazing Sword and Sacred Stones (if I've got my titles correct, either way it's two GBA Fire Emblem games). (The caveat here is that those are both entirely in Japanese)
They're actually getting The Binding Blade (the one with Roy as the main character that has never had an official English release) and the Blazing Blade.
Sacred Stones doesn't appear to be available anywhere on the service (yet).
I hope they add all the previous FE games, including Shadow Dragon and the Blade of Light to NES collection. They already released it separately for the limited time, why not just add it to NSO collection?