This means that the hardware (graphics controller) supports from 11.1 and higher up to 12.0 DirectX version.
So since im running Windows 10 pro (which has DX12 built in), latest Intel drivers... and dxdiag(showing as featured 9.1 - 11.1) and Intel control panel still show that I´m stuck with DX11.1 - or am I missing something?
4th Gen Graphics and higher - all are supporting DX12
You can see it by the Driver Model: WDDM2 + Runtime Version: 12.0 + Hardware class: 11.1 (or better)
This means that the hardware is of a class 11.1 but it exactly means it is supporting DX12 features