The move's interesting because Microsoft has traditionally heavily associated itself with Call Of Duty.

The exclusivity window's not quite as large as Microsoft's Call Of Duty deal, with Sony only getting a week-long exclusivity period for Battlefield 3. But it's still big news. We can't say we're the biggest fans of timed exclusivity in the first-place, but it's definitely nice to not be on the receiving end for once.

Back To Karkand will be the first DLC pack to advantage of the exclusivity deal, re-imagining some of the most loved maps from Battlefield 2 in DICE's new Frostbite 2 engine. It'll be followed by all further packs, receiving a one week window of exclusivity on Sony's system.

In other news, DICE has reconfirmed that Battlefield 3's open beta will kick off on PS3 from September 29th. Those that purchased Medal Of Honor will get access to the beta 48-hours earlier, starting September 27th.

For more information, check out the PlayStation Blog.