Nintendo joins Khronos in September, will help development of Vulkan's API for release at the end of 2015. The NX will most definitely use this to have amazing GPU/CPU performance by getting the most out of each chip.
Not sure if you guys realized this but this means the NX will be able to run basically any modern High End Graphics Engine that is currently available with great results.
I also read that Sony could adopt a form of Vulkan to work with the PS4, but Open GL probably is best suited for it. The NX is forward thinking for Nintendo thanks to them partnering with Khronos. The console will be able to run any engine a developer can throw at it and is not so limited as DX12 is since it's exclusive to Windows 10.