Say hello to fully automated GitHub mirrors of every plugin in the WordPress.org plugin repository. These aren’t your typical plugin Git repositories. These mirrors can be used for fast, efficient, and automated plugin updates using Composer, and don’t require “sync scripts” or separate Subversion checkouts for plugin development. They also offer a way for plugin developers to make the move to Git even while others continue working on the same plugin using Subversion uninterrupted.
Impressive, and quite useful.