etking on 08 April 2014
DX12 will be twice as fast as DX11 but the X1 does not use DX at all in most cases. The low level API that is being used by most developers already has the speed of DX12 right now.
Only tech demos written in DX will be faster but no actual games because they are allready written in a low level, mantle-like API.
There will be no speed improvement for X1 games, only the idie games and tech demos written in DX will benefit.
