Well done, Google.
This release doesn't change Google's strategy nor the fact that they will continue to release Android's source code in the future with a significant delay compared to early-access partners. There's no reason to congratulate them now nor complain louder some months from now, they'll continue to do what makes sense for them from a business standpoint. The only news are the yet-to-be-discovered jewels in the just-released source code.
No viable successful open source mobile OS gives equal access to public and OEM partners to a private tree
This is a true statement but you've set the bar pretty low there with 4 qualifiers.