Microsoft, it's good that you're working on improvements to DirectX that'll enable lower overhead and faster performance. But don't make people pay to upgrade Windows just to get the new DirectX version. Like how DirectX 10 was only available if people upgraded to Vista, and DirectX 11.2 is only available on Windows 8.1. It's a good way to encourage gamers to download service packs, yes—Windows 7 users should have the latest service packs installed, and if the only way to get them to do that is to hold DirectX 11.1 over their heads, well, we can understand. But don't tie them to OS upgrades that cost $100, especially if only every other operating system version is worth installing. Tying DirectX 10 to Windows Vista just made gamers angry, and they found a way to install Halo 2—the big Vista exclusive—on XP, anyway.
Hell, if you're feeling really generous, don't tie DirectX to Windows at all. Set it free. After all, AMD, Nvidia, and Intel are working on reducing driver overhead in OpenGL, too, and that'll work everywhere, not just on Windows. Cough, SteamOS, cough cough.