_*I*_think_ Google will be much more upstream friendly with this one. I can imagine that they will go rolling release and actively push new kernels etc. They could use a snapshotting FS for desaster recovery. I think they will use an OpenGL WM and they will use KMS, PulseAudio and maybe even Ksplice because they want to push updates silently without user notification. I should just work and not bother people with technicalities.
I think such an approach is sufficiently different that it might work.