First off all the hub bub about DX11.1 not being allowed on Windows (at this time) is really pointless. There aren't many DX11.1 titles on the horizon, and, if you've looked around, there aren't even that many DX11 titles out. And a lot of those are patched to DX11 after
release. List of games with DirectX 11 support - Wikipedia, the free encyclopedia
Anyway my take is DX11.1 will come to Windows 7 eventually as Windows 8 isn't likely to replace Windows 7 the way Windows 7 replaced the aging XP. Also note that Vista was released with DX10.1, but shortly after 7's release, it got upgraded to DX11.
And I would wait for official word from Microsoft
themselves rather than the "I heard it from some guy" statement.