A new extension version (v28) supporting GNOME Shell 3.12 has been released and can be found as usual from the extension website or downloaded manually from the release page. See also the alternative installation methods
This release doesn’t include any new features apart from some minor bug fixings. It’s a port of the previous version to GNOME 3.12 just in time for the new Shell release.
Release notes
- Port to Gnome Shell 3.12