I really think the iPad threw a small monkey-wrench into Google's plans for both Android and Chrome OS. When they were both announced there was a clear delineation between mobile OS and Desktop OS; the iPad has blurred the line somewhat though it appears that the keyboard is also what ditinguishes which apple devices get the mobile OS (iPad) from those with the desktop OS (MacBook Air).

Interestingly Microsoft, Apple, and Google all have the same "problem": they each have 2 operating systems when it appears there is an ongoing convergence between "mobile" devices and "desktop" devices.