Yeah... about that. The optimizations are being done to the engine, not BF4. So any game using frostbite 3 will have mantle optimizations, which currently include, but are not limited to Battlefield 4, Mirror's Edge 2, Dragon Age: Inquisition, Need for Speed: Rivals, Plants Vs Zombies: Garden Warfare, Mass Effect 4 and Star Wars: Battlefront.
Pretty big games, huh? Then you have people like activision already pledging to use mantle, and an AMD manager being interviewed saying their were even more undisclosed company's pledging to use mantle.
What are you going to come up with next? Nvidia's physx fur in the witcher 3 performs 9000% better than AMD? Selective thinking bro.