Buying Medal of Honor Warfighter will not be the only way
EA and DICE have confirmed that while they would like people to purchase Medal of Honor Warfighter, it will not be the only way to gain access to the Battlefield 4 beta. While getting the Limited Edition of Medal of Honor Warfighter is the best way to guarantee that you will get access, other options will be available; but they are not ready to talk about them just yet.
EA confirmed with the announcement of the Medal of Honor Warfighter that you could get access to the Battlefield 4 Beta by pre-ordering Medal of Honor Warfighter and getting the Limited Edition version. Initially, it seemed that was going to be the only way to get beta access.
Sources tell us that EA and DICE have a number of other options planned in order to get access to the Battlefield 4 Beta; but if you want to make sure that you get access, getting the Limited Edition of Medal of Honor Warfighter is still the best way.