The Geometry Wars 3: Dimensions website has details on a free expansion coming on March 31st to add a bunch of free content to the bullet-hell shooter (thanks PC Gamer). They call the update Geometry Wars3: Dimensions Evolved, and offer this trailer to show off what it involves. Here's word:

Geometry Wars³: Dimensions Evolved delivers the full evolution of the award-winning franchise with over 100 levels, expanded Classic Mode, dynamic 3D grids, powerful drones & supers, “Hardcore” mode, and Local Co-op + Online MP modes. Geometry Wars³: Dimensions players will get Geometry Wars³: Dimensions Evolved as a free title update when the new edition is released.