These sound good for a start.
1) Expand up to 4GB memory space beyond 16MB.
2) Add new instructions that handles 4GB memory address.
3) Add Protected Memory
6) Emulate 6502 and 65816 games under GS/OS with 32-bits (Like Mac OS X)
9) Replace 24-bits to 48-bits memory addressing or use flat memory
The biggest issue > problem With the existing GS is the video out. What I would like to see is a video out capable of addressing a plasma screen. I have an oldish PB 190 with and upgraded color screen which I would happily transfer to a newGS if a good display screen could be made.
Something to ponder Hilary