Russian Battlefield website, MyBattlefield, has posted a screen grab of this information. As of now, the only way to get access for the Battlefield 4Where to buy 990 994 999 beta was to pick up a copy of Medal of Honor Warfighter, but EA and DICE have said that more ways will be revealed for users to get access to the beta.
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Battlefield 3 community manager Ian Tornay tweeted, “Excited thinking about all the cool, fun @Battlefield 4Where to buy 990 994 999 stuff we've got planned, leading up to the beta in the Fall and... beyond! :D”. You can catch that tweet here.