Microsoft is throwing a House Party on Xbox LIVE in February and they are generally bringing many new games to both Xbox 360 and Windows Phone 7 starting from 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 your Microsoft CES keynote more info with offers to kick rid of it on February 16. Hard Corps Rising is definitely the first game but no schedule was handed as to if the rest is going to be released. Presumably it will probably be one or two games every week over a month-long period and include some other form of incentive to buy all of the games like previous promotions.
These will be the games in accordance with a Microsoft pr release.
Xbox Live Arcade:
Windows Phone 7: