Windows 7 screenshots are showing up, for example on thinknext.net and windowsvienna.com. Much to see? Well, ribbon UI in WordPad and Paint; a much-enhanced Calculator with Standard, Scientific, Programmer, Statistics and Date Calculation modes; and an IDE, sorry ISE (Integrated Script Environment) for PowerShell.
Presuming these are genuine, they don’t tell us a lot about Windows 7 except that, as widely predicted, it looks more like a refined version of Vista than something boldly different. Given that Server 2008 turned out nicely, I’d say that’s no bad thing.
For the official word on Windows 7, see the Engineering Blog.