It's hard not to draw connections between the various events of the last week or so: 1) Google/Samsung patent deal, 2) Google purchases Nest, 3) Google sells Motorola, 4) Samsung suddenly cools on Tizen.

Theory: Google gets offered the opportunity to buy Nest. Either Larry or Sergey gets serious interested. They bought Motorola because they wanted a serious stake in the hardware market. They toss up which is better - Motorola or Nest? They decide Nest is the winner. They realize the valuations are such that they could pretty much just swap Motorola for Nest. But there's a problem: Motorola was also their insurance for making sure they would always have an OEM to make Android handsets. If Samsung ever turned - they would never find themselves unable to secure a Nexus partner. So they go to Samsung, and offer a deal: patents, guarantees of support, probably other stuff: as long as you agree to make Android your flagship each year AND GPE phone version of it. This seems good enough. Motorola not needed any more and they can get a new toy to play with - Nest is the winner.