You are one of the few that think that what he's been saying is articulate. Most think it's garbled, and I agree. It's true that he's moving away somewhat from Ballmer's ideas, but is he really? If he was moving away from devices and services, he would just fold the entire Nokia thing up, and drop tablets altogether. Both are failures, with no good vision showing how they can be otherwise.
As far as this cloud and multiple OS device support, well, Ballmer began that before he left. Nadella is just adding to it.
Really, if he does come out with some articulate vision, he hasn't stated it clearly so far.