Just read this article Why Metro now rules at Microsoft157158 and it seems to me that MS will just blindly slap Metro on everything. They already screwed up the Xbox 360 UI with Metro (the "old" NXE had much higher usability) and it seems they won't stop here. The "problem" with Metro is that it really works only with touch input. On the 360 navigation on the Metro enabled UI with the left analog stick is painful inadequate (you're basically navigating in sub tiles all part of a larger tile) and you also have to use the "shoulder" buttons for navigating the top tabs. Compare this with NXE where you just flip left/right with the analog stick
So Microsoft please stop slapping Metro on everything. It only works fine with touch input .