There are some new docs in the pipe for Evergreen but they're mostly "remember we told you that register was at offset XXX ? Guess what, we moved it...".
We haven't really looked at using any of the compute bits so far - it's been more a matter of "how do we turn off all the compute stuff so we can get basic 3D working ?". It's probably going to make sense to open up the bits for pure compute as well but I haven't had that internal discussion yet.