I understand you are looking for Intel video driver supporting WDDM 1.2.
At this stage, driver support for your product is only offered through your computer manufacturer. I recommend checking the link below for driver assistance:
thank you for quick reply. I know, that I should ask for the specific device support at the manufacturer, but they will quite logically tell me "Intel doesn't have the driver, sorry".
I really think, that it wouldn't be such a big thing for Intel to release the drivers, as the device is pretty much capable of supporting it and is well capable of basic HW acceleration. At the same time it wouldn't hurt new device sales, it would do the opposite - users would see a great support for people, who use company's product.
I also have a new laptop with integrated Intel graphics and I hope, that it won't be obsolete in two years, when some new Windows version comes and needs a little bit different drivers.
With tablets this is really important, as the price for new device isn't so low and you can't simply swap the video card for example.