When the DS was announced N said it was not the new Gameboy but a new platform and the GB would still be around. Recently however, that has been changed to there is not another GB in the works (at least not the next advancement of the GBA). I agree with a previous poster that the GB name will be used and should be used, perhaps in a DS 2.

Speaking of DS, I would expect one with even better graphics, possible small discs instead of carts and a memory chip or small HD, much like an mp3 player. Also possibly other forms of entertainment built in like music, movies, 'net access. Oh and the touch screen is here to stay, given their hunt for non-gamer customers and the success of the system. Also look for integration between portable and console systems, which has been hinted at between DS and Wii but not yet disclosed. I expect that whatever interaction N has planned between DS and Wii will be pretty basic but in the next round it will be much more sophisticated.