Last time Microsoft attempted something new, we ended up with Metro.

For the record, I love Metro. It's a beautiful interface. Perfect for phones. Wonderful for tablets. Unfortunately, Microsoft decided to half-ass it on tablets (dumping a user into the 'normal desktop' when some things are run, not enforcing application programmers to go all-in on the interface, or allowing a choice).

Additionally, they decided to put it on desktops, which was a very poor decision, too. Not to mention servers.