I'd say: Second analogue nub - We'd finally have decent controls for more 3D games... Internal memory - 4GB ? Tilt sensor - imagine the fun Loco Roco 2 would be? Backup flash - With an option or some sort of backup feature that restores the factory settings if it ever got itself "bricked". It's beyond me why this wasn't in the original model... Other possibilities could be things like built in camera, which could potentially be used as the tilt sensor in some... Weird way. They may take out the UMD drive as they've decided backwards compatibility isn't as important now too. Of course, we can speculate all sorts of crazy ideas, like TV-out, upgraded wireless(802.11g/n instead of 802.11b), holographic projection modules...
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