Gamasutra has an interview with Mario Wynands of Sidhe discussing Shatter (thanks IGN), in which possibility of a PC port of the blockbuster game is discussed:

Our tools and technology are very cross platform, and we have also ported PhyreEngine to the 360 which we used for GripShift XBLA. We already have working builds of Shatter on PC and XBLA but are reviewing the situation to see whether it makes sense to continue investing in those versions to bring them to completion and release them.

So far, it is looking likely we will bring the game to other platforms.