Microsoft announced gave some solid dates on their Xbox Live Block Party titles and the new Game Room service.
For the actual games on XBLA, Toy Soldiers (1200 points) will be releasing on March 3rd, Scrap Metal (1200 points) March 10th, and Perfect Dark March (800 points) 17th.
The Game Room service, which allows players to have their own virtual arcade, will be launched March 24th and will be free to download. Unfortunately you will have to pay from 240 Microsoft points to 400 Microsoft points for the actual games in it.
(Source: Major Nelson’s Blog)