If history is any indicator it's coming up on time for a new handheld from Nintendo. Not just a revision of the DS, but a successor to the line. So, let's hear it. What do you think the DS2 will look like, feature, etc, etc.?
My take.
It won't be the DS 2 at all. Nintendo seems to have shied away from the traditional method of naming systems when they broke with the Game Boy name. Also, it won't have two screens. *gasp* That's right. One screen. I think they will go a route similar to the ipod. One screen which can be 'split' when needed for dual screen games. Normal game play will be with the unit held horizontally. For backwards compatibility, and new games which may want to use a dual screen approach, the unit will be held vertically. The analog D-pad may be positioned off center to aid in vertical, legacy play.
Beyond that, gorgeous screen, wifi built in(natch), blu-tooth, basic PDA functions, and dual cart slots(for DS and new, non-standard media).
A big maybe will be an online store, similar to the one for the Wii. Game available will be portable classics from Game Boy, Game Gear, Lynx, etc.
*edit* a thread at toomanygames inspired this one. Check it out if interested.