Well Windows 8 beta build was leaked. The new features? Well so far non really except for the new desktop wallpaper: source: http://www.engadget.com/2011/04/13/windows-8-leaked-caught-looking-a-lot-like-windows-7/ UPDATE: You can run it from a USB stick as a whole OS. source: http://gizmodo.com/#!5792468/windows-8-can-be-run-from-a-usb-stick
Seeing how this is the 1st Milestone, and was actually released to devs last October September, I wouldn't have expected much to have changed... Noticeable UI changes won't happen until around Alpha or maybe even 1st Beta....
Same UI, nonetheless. Vista, 7, 8. I don't have the money to buy a Mac, or else I would've not been a Windows' fan till now.