Not unlike Microsoft and Activision's agreement to give Xbox early access to Call of Duty DLC, Sony and EA have arranged for Battlefield 3 expansions to arrive with an exclusive lead on PlayStation 3. However, Battlefield 3's expansions will stay exclusive to the PS3 for a shorter period: one week per expansion.

The deal kicks off with "Back to Karkand," which launches "later this year" and brings with it four Battlefield 2 maps (including Wake Island) rebuilt in the Frostbite 2.0 engine. The expansion comes free with first-run copies of Battlefield 3 for all platforms, though it now seems it won't be available for download immediately.

The Battlefield 3 beta opens on PC (check the system requirements), PS3 and Xbox 360 on September 29.

This article was originally published on Joystiq.