From my chats with HerbFargus (one of the big contributors) this is what’s going on.
–Retropie on Raspbian Jessie (no noticeable changes, but future-proofs the project)
–Making only a core set of emulators installed by default on the image (SNES, Genesis, N64, PSX, etc. Rest still installable via the retropie setup script)
–Keeping emulators in the project up to date as they become available
–Adding more linux based or open source games to the ports section (please bring them to the forums attention if you know of some good ones!)
That’s all I can remember off the top of my head.