It will not be a new DS. The DS is still selling amazingly well. Just in December the DS sold over 3 million units of hardware and was only topped by the Wii.
It will not be a Wii 2. There is no need for Nintendo to chase Sony and Microsoft in the HD department. The Wii is the best selling platform this gen and does not show signs of slowing down. Even if sales do slow down they can release more colors or drop the price or bundle the Wii with software. There's still a lot of sales left in the Wii. Also the Wii remote has not shown all of it's potential and nor has the Wii motion plus add on. Games designed around both of those devices could and would be really interesting. A game like Command and Conquer, a strategy RPG using the IR, or a Third Person shooter like Second Sight using the IR could be good. There's a lot more software to develop on the Wii.
If Nintendo is successful at the moment, it’s because they are good, and I cannot blame them for that. What we should do is try to be just as good.----Laurent Benadiba
