Google hasn't said anything about the software APIs for this new operating system (have they?). Presumably, they'll want to leverage all the work on their Android platform and make that the client-side API of choice. The alternative is either high-level JavaScript programming (good for widgets, but you wouldn't write serious apps) or exposing the Linux guts below (presumably, something you want to avoid to stay nimble in your ability to evolve the platform, such as to non-x86 processors).