349.65 has been released for the Windows 10 (technical preview of course). That's the first WDDM 2.0 [Edit: Whether or not it supports DX12 is not clear] driver and it seems it's not available for now from nVidia directly, but only via Microsoft's Windows Update.
So far OK folding a P9411 WU on my 970 - PPD is around 290k with TPF around 4 mins 10 secs.