While true, Google engineers have stated that they want the android source to be in the mainstream kernel "in a long term" and i happen to believe that.<p>It's just not on top of their priority list, which is fine for me. I'd rather have bugfixes and things like that as a focus before kernel inclusion. Eventually Google should hire a developer dedicated to that task. Plus, it's not like they are developing in the dark, everyone has access to <a href="http://android.git.kernel.org/" rel="nofollow">http://android.git.kernel.org/</a> and is free to use it.<p>Also, we can hardly speak of a fork, as new android versions are based on newer kernel versions, which means their work has to be somewhat flexible and compatible enough to catch up with newer kernels, anyway.<p>Also, as i tend to think google engineers are not _that_ dumb, there may be very good reasons to write a specialized security model or framebuffer system. They probably didn't rewrite that stuff just because of the fun of it.