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Battlefield 4 is most certainly a game, as EA confirmed this morning via a trailer for this year's Danger Close shooter, Medal of Honor: Warf!ghter. According to the publisher, pre-orders of Warf!ghter's "limited edition" get direct access "to the exclusive Battlefield 4 beta" – of course, we've never actually seen or heard of Battlefield 4 outside of a leaked image a few days ago revealing its existence.
EA's Danger Close studio is responsible for the Medal of Honor series, though Battlefield developer DICE a.ssisted with the first MoH reboot. DICE created the Battlefield series, and it stands to reason that the Swedish studio would also be behind Battlefield 4. We've reached out to EA for more info.
It seems unlikely that this reveal was unintentional, as EA UK marketing man Dan Sheridan tweeted, "Pre-order #MOH Warf!ghter & get access to #BF4Beta" with a link to the video and preview page. EA's US reps have yet to say a word.
Update: EA made the news official in a press release just now, confirming a "fall 2013" window for the game's beta.