The Uncharted 3 Multiplayer will be available at 5 PM EST today. It is available to all PSN subscribers as well as anyone who purchased marked copies of Infamous 2. The beta will last until July 13th. There are Trophies and rewards that will carry over into the full version of the game. The beta will be Co-Op modes only for both online and splitscreen play.
Also IGN is giving out some free codes so get them while you can. Link Below.