Rescaling DS screens for 3DS is going to be hard. A 25% increase doesn't really scale nicely. I think they'll just have a black border around DS games, just like the DS had black borders around GBA games.
I wonder what the difference between the new Home button and the DSi's Power button (push once to restart, hold to turn off) will be. Maybe something like the PSP's PS button (system menu while the game is suspended)?
What kind of gimmicky mini-games will developers come up with for the new sensors do you think? It seemed like every early game for the DS had to have some pointless microphone-blowing in it.

