DICE team is bringing wonderful option for all participants of Battlefield 3 PC Open Beta! We will all be able to test map Caspian Border, map which handles 64 players with all kinds of vehicles, jet and helicopter.
This is gonna be a huge stress test so we can get out a better final version. You can test the map from this afternoon and till Sunday 10th October once the Open Beta test is going to close down. Make sure you thick on the Caspian border map in your browser

"Some users may see "You were kicked by an administrator" when dropped from the game. This is not accurate (beta!) and relates to being dropped by the server. Thank you for your continued participation in our beta!"

Source: Battlelog / Battlefield 3 Forums