This isn't confirmation by any means, but just the fact that they are considering the idea has me pumped. I would love to see this come true and would even pay $60 for a retail copy of all the previous 2D games (DS duo included) upgraded in HD.
Linkage of Possible Awesomeness.
Nishiyama: There's always the possibility. Whether it would be viable remains to be seen, but having a new game - or even a remake of the GBA games, which we now can't use [thanks to the DSi] - would certainly be possible. If we made one, would you buy it?
Nishiyama: [laughs] Great! One of our ideas has been that on older consoles, you may have had only 16 colours. One thing we could do is make a game like Mega Man 9; do a new Sonic, but in an old style.