Microsoft is throwing a House Party on Xbox LIVE in February and they're bringing numerous new games to both Xbox 360 and Windows Phone 7 between the PC classic Torchlight to a HD remake of Beyond Good and Evil together with Hard Corps Uprising.
The announcement of the House Party promotion came as soon as the Microsoft CES keynote with promises to kick it on February 16. Hard Corps Rising could be the first game but no schedule was presented as to if the rest is going read more to be released. Presumably it will likely be one or two games per week over a month-long period and include some other kind of incentive to get all of the games like previous promotions.
These are definitely the games in accordance with a Microsoft blog post.
Xbox Live Arcade:
Windows Phone 7: