Will Unreal Engine 4 have OpenGL Vulkan support in the future?
It seems really well thought out for a OpenGL API, already supported by major vendors (Intel, AMD, NVidia), is cross platform (Windows, Linux and Android so far) and promises speeds comparable to DirectX 12.
New: Clear colors for hardware clears are now bound to render targets at creation time. Optimization for upcoming graphics APIs. (DX12, Vulkan). Source.