- It will have a lot more onboard storage. 2gigs would be nice.
- memory card slot if 2gigs isnt enough for you.
- 3ds games will be both downloadable and physical media will be available in stores.
- the physical media will be mini dvds. same as the gamecube.
- making it partially (if not completely) gamecube backwards compatible.
- full on app store.
- gameboy/gamegear/neogeo pocket vc
and thats all the crazies i can think of right now.