I mean, the cosmic de might be couple months or years away.. will system76 wait until cosmic de is ready to release Pop 24.04... or will they release Pop 24.04 with gnome Cosmic while working on the cosmic de ?
Unfortunately, there will not be a release of Pop 24.04 with GNOME before COSMIC is released. In fact, System76 has stopped development of Pop-shell as referenced here:
Once, Pop 24.04 is released, you will be able to install gnome-session to get GNOME, but it will be the version from Ubuntu and not Pop-shell (though you can install the unsupported extension yourself).
Basically, the development of COSMIC is delaying the release of Pop 24.04... which means the whole distro update probably won't come until 2025 as the desktop matures.
For this reason, among others, I've decided to switch to Ubuntu until COSMIC matures and Pop 24.04 is released.
All my servers moved to 24.04 and I wanted my desktop to keep in line with them (so they all had the same packages). Likewise, I've been following the development of GNOME and I really liked what they have done with versions 45 and 46, so I wanted to try a more modern version of that desktop environment (Pop 22.04 is still on GNOME 42 and is now missing out on some cool features like the quick settings menu).
Finally, I wanted to try out Wayland and the experience on Pop 22.04 is not great with Wayland, especially since it is missing out on the more recent fixes and updates in Ubuntu 24.04.
If you are happy with Pop 22.04 and willing to wait for COSMIC to stabilize and become feature complete, then that is what you should do. For me, I used this delay in releasing Pop 24.04 as an opportunity to try out something different and for the most part, I'm pretty happy with the experience.