12.1.0 an OLPC OS release, with focus on shifting parts of the Sugar UI to the GTK+ 3 toolkit and to new system technologies present in Fedora 17. The target platforms are XO-1, XO-1.5 (including XO-1.5 High School Edition) and XO-1.75.
The release plan can be found at /Release plan.
Released on 2012-08-31
Release notes: Release notes/12.1.0
Final build number: 21
 Download and installation
Download and installation instructions can now be found in the release notes.
The release is built with OS Builder version 5.0.x under Fedora 17.