Battlefield 4 is the next and upcoming installment of the Battlefield series and the sequel to Battlefield 3 which is being developed for next-gen consoles (but being scaled down to be compatible with current gen consoles). It is also the thirteenth iteration in the franchise. The game was announced by Frank Gibeau, CEO of Electronic Arts. Battlefield 4 was revealed accidentally as a pre-order listing discovered on the Origin Client. By going to the shooter genre one will see a banner entitling Medal of Honor: Warfighter, with an exclusive pre-order offer for the Battlefield 4 beta as seen here. EA later confirmed this and that the beta for Battlefield 4 will take place in Fall 2013.
Currently, the only ways to get into the beta is to pre-order Medal of Honor: Warfighter, pre-order Battlefield 4 Digital Deluxe Edition on Origin.com, and by being a Battlefield 3 Premium Member. DICE has stated that there may be other ways in the future in addition to these methods.