It was accidentally revealed last week via EA’s Origin service, now through the newest trailer for Medal of Honor: Warfighter it’s now official. All that is known about the Battlefield 4 Beta is that it will arrive fall 2013 and the only current way to access it is to get hold of the Limited Edition of Medal of Honor: Warfighter.
Personally I would prefer to see Battlefield: Bad Company 3, And hope that Battlefield Premium members can get access to the Battlefield 4 beta also as I am still on the fence for Medal of Honor: Warfighter.
You can check out the trailer for yourself that goes into a lot more detail about some of the Multiplayer mechanics that you will be encountering in Medal of Honor: Warfighter.