According to a brief banner on EAs’ site, it would seem preordering Medal of Honor: Warfighter gives beta access to Battlefield 4. Considering the first Medal of Honor included beta access for 3, it makes sense, but the real highlight is the mention of Battlefield 4. This is because while the title was inevitable, it still has yet to be officially announced.
Sadly the banner has since been taken down, but could mean theres a Battlefield 4 announcement around the corner. Sadly only time will tell, but keep checking JustPushStart for more information as it arises.