Microsoft leaks IE9 screenshot

Minimalistic
The UI has apparently undergone an massive overhaul and it looks a lot cleaner, simplistic even. Actually it looks quite a lot better than the 8, as most of the menus appear to be hidden. My Favorites? Nowhere to be seen. History? Who needs it, just browse ahead and don't look back.
Frankly, it looks quite a bit better than the old version and we can only hope that the UI will be simple and intuitive, but it’s still a bit too early to say.
On the tech front IE9 should deliver a few new features and improvements, including optimized JavaScrip implementation and HTML5 support, CSS3 extensions, Direct2D and support for H264 video.
Microsoft is expected to out the beta version on September 15.
More here.