megaman79 said: Multi touch screen - but more importantly, and relatable to the nub thing you get, would be the use of two finger sensors that allows you to grab and pinch in the air. Btw, i don't have a DS, i liked it when i first saw it but i just wasn't convinced enough like i was with the Wii.
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An IR emitter and camera could pick up finger movements like this without the need for nubs. Also only the DS Phat has a thumb nub. I'm pretty sure Nintendo would have looked into this kind of thing and if they can make it practical in gameplay then I'm sure it'll be used but it might not be that useful when you think about it.
For me, I'd like a DS that has a clamshell design with one big foldable screen, big enough for two players to play simple games like air hockey using the one system. Because of the screens size, it'd be able to be backward compatible with DS, something like this but with buttons etc..
Probably too expensive to expect from Nintendo but it'd be cool :P