It seems that Microsoft made several Windows 7 teasers. Though it doesn’t actually say it’s Windows 7, you could probably already guess it is.
So there’s two of them. The first one is about Windows 7 and how it can be accessed/connected anywhere. Like some strong "integration" feature for Win7.
I thought that was a good one. There’s also another one, about how Win7 "includes smartphones, mobile connectivity, cross-platform communication, Tablet PCs, virtual office synchronization, collaborative editing, professional networking (think LinkedIn), VOIP, internet shopping and remote presentations with video"
Via Long Zheng.
Both very similar videos, and both to give a rough look at Windows 7 and what it can do.