"Why Snes?" I'll tell ya why... agreed, it's familiar territory what with the two emu's which have already been available for some time now..
but the fact is, most people that have expressed interest in buying a GP32 in the first place did so cause of the promise of things like a well-performing Snes emulator.
so yeah, Amiga and etc. are all very much desired, but I think it goes without saying at this point that the two most in-demand apps for GP32 are 1. Snes and 2. Mame - those seem to be the things asked about the most when Joe Schmoe passes through a GP32 forum trying to see what the hubbub is about.
For the record, I am not expecting that this project actually will be a Snes emulator, though of course that would be really nice if it were the case. It's fun speculating anyway..