Battlefield is AMD sponsored, right? Will it use Vulkan, too? Would be nice to see what other games will get the Vulkan API.
nVidia is also seeing some performance boosts with it so it's a win-win, it seems.
AMD worked with DICE to get Mantle support in Battlefield 4. Since Vulkan is built with significant portions of Mantle in it, they really ought to be able to add Vulkan support to the Frostbite engine at some point. But there's no guarantee, maybe Microsoft will offer them a better deal focusing on DX12.
BF4 actually tends to run a little better on newer Nvidia cards than on competing AMD cards, by the way. So I wouldn't really call it AMD sponsored
beyond the Mantle thing (and the bundle deals they did back in the day).