Microsoft is throwing a House Party on Xbox LIVE in February and they are generally bringing quite a few 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 along with Hard Corps Uprising.
The announcement of the House Party promotion came following your Microsoft CES keynote with intends to kick it on February 16. Hard Corps Rising would be the first game but no schedule was handed as to if the rest is going to be released. Presumably it will likely be one or two games per week over a month-long period you need to include some other form of incentive to obtain all of the games like previous promotions.
These would be here the games in accordance with a Microsoft website article.
Xbox Live Arcade:
Windows Phone 7: