Assassin's Creed: Brotherhood multiplayer beta. Ubisoft has announced a start date of September 13 -- and remember, it's exclusive to PS3. The only way to get access to the beta in North America (for now, at least) is by pre-ordering the game at your local GameStop.
There are apparently only a limited number of slots available in the beta, so tokens will be doled out to customers on a first-come, first-serve basis. If you already pre-ordered, you can bring your receipt to a GameStop starting on August 9 for entry. The beta entry process for those who live on, say, any other continent in the world is still unknown, but you can be sure that we've asked Ubisoft for more info.