Paul has been passed on an image from Mary Jo Foley which has the Internet Explorer 9 UI Revealed. Looks nice and clean for sure, with lots of room to be filled with Ask.com, eBay, Bing and Yahoo search bars. The big test for me will be how fast does a new tab get created, because I have minimal issues with the actual rendering of IE8, it's the fast it takes longer than a few milliseconds to create a new tab (clocked at 4 seconds by counting Mississippis) which is completely unacceptable. Even setting the 'new tab page' to 'about blank' has it taking 2 seconds on a dual core, 3G machine.
Still, I like the clean and chrome-like UI, really short area available for tabs could be problematic. Guess we'll see what happens when it's released next month.