countdown site has launched, which features only a clock and the Nintendo DS logo. Considering the URL is square-enix.co.jp/ctds, we're going to take a guess and say it's Chrono Trigger DS. It could be a remake, a sequel ... or something entirely different. Chrono Tetris, perhaps?
Screw that. Who are we kidding?
[Thanks to everyone that sent this in! And to Square Enix, for doing something right.]