Percona is glad to announce the ALPHA release of Percona Server 5.6.6-60.1 on August 27, 2012 (Downloads are available here and from the EXPERIMENTAL Percona Software Repositories, although currently only for RHEL/CentOS as we are working on ensuring compatibility with our Debian/Ubuntu packages).
Based on MySQL 5.6.6, including all the bug fixes in it, Percona Server 5.6.6-60.1 is the second ALPHA release in the Percona Server 5.6 series. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.6.6-60.1 milestone at Launchpad.