Microsoft is throwing a House Party on Xbox LIVE in February and they are generally bringing numerous new games to their Xbox 360 and Windows Phone 7 starting from the PC classic Torchlight to a HD remake of Beyond Good and Evil and also Hard Corps Uprising.
The announcement of the House Party promotion came following the Microsoft CES keynote with intentions to kick it on February 16. Hard Corps Rising may be the first game but no schedule was handed as to in the event the rest will probably be released. Presumably it is going to be one or two games every week over a month-long period and include some other type of incentive to obtain all of the games like previous promotions.
These will be the games based on a Microsoft website more info article.
Xbox Live Arcade:
Windows Phone 7: