Microsoft is throwing a House Party on Xbox LIVE in February and they're bringing quite a few new games to the Xbox 360 and Windows Phone 7 between the PC classic Torchlight with an HD remake of Beyond Good and Evil together with Hard Corps Uprising.
The announcement of the House Party promotion came following Microsoft CES keynote with offers to kick rid of it on February 16. Hard Corps Rising may be the first game but no schedule was presented as to if here the rest will likely be released. Presumably it will probably be one or two games each week over a month-long period and include some other kind of incentive to acquire all of the games like previous promotions.
These would be the games as outlined by a Microsoft news release.
Xbox Live Arcade:
Windows Phone 7: