Android OS development will now fully happen behind closed doors, but Google says it's committed to releasing source code

TL;DR

• Google has confirmed to Android Authority that development of the Android operating system will soon fully happen in private.
• Currently, Google shares some of the work it does on the public AOSP Gerrit, but moving forward, this work will all be done in private.
• The goal for this privatization is to simplify Android OS development and not to hinder external developers, which is why Google remains committed to publishing source code to AOSP after each release.

...read more at androidauthority.com