Even when windows 7 hasn’t hit the stores, some concept videos of Windows 8 has already been out. Actually I tend to find it much better than Windows 7. Have a look at it yourself.
[youtube:7guNbpRMjwU]
It does have some concepts from bumptop.
Windows_8_Concept_Video_(low quality - flv) (4.82 mb)
Windows_8_Concept_Video_(high quality - mp4) (6.89 mb)