DKII on 02 January 2008
Well it would cover NES, SNES, and GB/GBC games pretty well. N64 would be a bit more difficult and would require some kind of touchscreen interface ala Mario 64 DS perhaps.
GBA games likely won't happen for the same main reason you don't see GC games -- the DS can already play GBA games so there's no reason to sell them separately when you can already play the physical copy.
