According to the latest issue of Nintendo Power, Geometry Wars is leaving it's previous Xbox 360 home and seeking new pastures on DS and Wii - at least a version called Galaxies is. It's also not being developed by Bizzare Creations but apparently by Kuju - Call of Duty: Finest Hour (Xbox), Battalion Wars (GameCube) among others.
Geometry Wars: Galaxies, will support both single and multi-player modes, and will "use the motion control in the Wii version and the touch control in the DS version", says NP.
Also apparently included in the Kuju/Nintendo versions will be a Geometry Wars: Retro Evolved - a much-loved and played Xbox Live Arcade version.
We've contacted Kuju to throw some light on the story. We'll update you as soon as we hear.
Source: Nintend Power