The fact that Microsoft is making D3D 11.2 a Windows 8.1 exclusive is extremely annoying. Yeah, I know Windows 8 sales haven't been what they wanted them to be, but are they really stupid enough to think that people are going to buy it for minor D3D update? The fact is that not everyone is upgrading to Windows 8, and as long as there is still a large chunk of people using Windows 7, it's going to be a pain in the ass to try and develop with D3D 11.2, so why even bother.
I think what you'll see is Windows only games not touching it and Console games using it IF it isn't too much trouble to implement in their engine (and by that I mean managing D3D11 and D3D11.2 paths, the supporting code will all be there due to the existence of these features on consoles).
The biggest problem is that if your shop isn't Win8 based then you won't be able to test/implement these features for tools development so things like painting terrain in a live in-game editor suddenly becomes much harder as you'll end up having to do the software solution in order to emulate it :|
(Edit: I'm half wondering how hard it would be to shift our engine at work to support GL4.3 so that, with updated hardware, we could support this via a different backend. )