EA has confirmed that a new Battlefield game will be released next year. During an earnings call for the third quarter of its 2013 fiscal year, EA Labels president Frank Gibeau said EA "will be launching a Battlefield game next year” and said EA is "very excited to show you guys more detail on that coming soon."
Gibeau didn’t elaborate beyond that or mention Battlefield 4 specifically, though he did add that “we're not announcing an annualization of Battlefield at this time.”
Preivously, EA advertised a Battlefield 4 beta as a pre-order promotion for Medal of Honor Warfighter on Origin last year. Later, DICE said the beta will be available in other ways and specified that Battlefield 4 will stay in a modern setting.
http://www.ign.com/articles/2013/01/31/new-battlefield-game-coming-next-year