FUD Zilla heard from multiple sources that AMD spent between $5 million and $8 million to secure the Battlefield 4 deal with EA. The site also heard that DICE will deliver a Mantle update to Battlefield 4 in December:
This is a big commitment for EA, AMD and Dice, but all sides will benefit from it. AMD will also gave the exclusive right to Dice to play with Mantle, a new AMD API that is set to become a third player in gaming APIs next to OpenGL and DirectX.
Dice has promised to bring a Mantle update to BF4 in December 2013 and we will have to wait and see if this brings any performance increase on the existing game. Mantle is supposed to talk to "metal" directly on the transistor level, potentially making everything faster and delivering some new effects that are outside DirectX 11.2 specification.