After analyzing the data from our first round of closed Caspian Border tests, we have great news for participants in the Battlefield 3 PC Open Beta: the DICE team has decided to bring back Caspian Border for the beta’s final weekend and conduct an open large scale test of the 64 player Caspian Border map.
*****Please keep in mind that as this is beta we will be stress testing our servers***** As such, users may experience crashes, network instability and outages as we roll out and configure servers and network utilities. Understand that such potential issues and the testing environment are not reflective or indicative of the final product and that, through your participation, you will be helping to ensure future stability and functionality.
As we are again specifically testing 64-player server configurations, this test will be for PC only. The Caspian Border servers will be available for all PC players to join. Caspian Border will be available starting Friday, October 7th, in the afternoon (CET).
http://battlelog.battlefield.com/bf3/forum/threadview/2826551518978117343/#!/bf3/forum/threadview/2826564925967583255/
Thu 14 Nov - 2:00 by 
Subject: Caspian Border - Weekend 64-Player PC Testing