There is a newer version of the Android SDK; however, the older version is being used on the tablets. Why?

I looked it up a while back when I attempted to do all the work myself (didn't work very well lol). From what I can remember it had something to do with the framebuffer/kernel interface to it changed? I also read that it was possible of using the userspace of the newer SDK, but for some reason people generally don't.

• What can be done to port the newer SDK?
• What can be done to increase the speed of Android on the N800?
(it runs smoother on cells with lower specs, the 400MHz proc should be more than adequate for running Android)

--Jon