Mass Effect 3 stars the series protagonist, Commander Shepard, who is now tasked with bringing an assault on the Reapers, which have now reached Earth and are killing off the human race as quickly as possible.
Unfortunately, information on the game outside of the tease of worldwide travel in the future is scarce. The game is slated for a holiday 2011 release, but no platform was announced alongside it. Mass Effect 2 has seen a release on both Xbox 360 and PC, and the game is also slated to get a PS3 release next month. It would be wise to assume that all three platforms will see a release of Mass Effect 3, but whether they will all be released at once remains to be seen.