As noted by Rafael Rivera on his site, it looks like we may see centered titlebar text in Aero Basic (picture below). While CEO Steve Ballmer made it a point to note that we weren't looking at a new UI, it is definately a change from Windows 7.

It must be a modified version of the windows 7 GUI.
If you also notice the minimize and maximize are missing.
I think its a limited functionality GUI

^I agree It looks that that version of 8 is questionable, becasue it could have been a modified theme of sorts, unless the only true changes they made were from the kernels and whatnot, if so its about time, because its been 10+ years, all MS has rely done is that it built on MS-DOS. With the exception of the 9x OSs.

Actually windows 7 was built more on power shell XD.

Windows 7 is built on NT technology using the similar NT 6.x code from Windows Vista. Powershell is just a more powerful version of Command Prompt.

Windows supported MS-DOS from Windows 1.01 to Windows ME, excluding all verisons of Windows that were built of the NT kernel (e.g. Windows NT: 3.1, 3.5, 3.51, 4.0, 2000, XP, Vista, and 7).