My take is this:
Apple iPads & iPhones have iOS, but Mac's have MAC-OS
Google phones & tablets have Android, but for PC hardware, they have Chrome.
Microsoft is bridging the gap between mobile devices and the computers that so frequently compliment them. No more crummy iTunes to take over the interfacing. I don't even know if Google has a bridge app for their systems. Cheers to MS for coming up with the logical next-step. Let the others go through the growing pains and discovery process. Now give the public what they want - seamless interaction.
This time next year, I expect to have a Windows 8 phone, tablet and PC all working in harmony together without a clunky synchronizing interface.
-EJ - Daytona Beach, FL

There actually won't be any tweaks to get rid of the Metro UI. In the leaked Beta screenshots, the close, minimize, and maximize buttons look like metro tiles, and the Aero UI is fairly gone, the back and forward buttons are also metro. Which means for the most part the entire UI will be metro.