I love minimal logo's, but I feel it's too much of a transition to what they had. Logo's should be slowly evolve into something else. They seamed to have jumped several evolution steps into what looks like a kind of Apple-look. A logo should symbolize what it is, Apple was always simple, hence is simple OS. Windows on the other hand has always been known for it's jammed packed product. I think they missed the train with this logo and just copied rival Apple.
Also, more importantly, what makes a good logo?