Based on MySQL 5.6.17, including all the bug fixes in it, Percona Server 5.6.17-66.0 is the current GA 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 5.6.17-66.0 milestone at Launchpad.
MySQL benchmarks (sql-bench directory in the MySQL distribution) has been made compatible with the TokuDB storage engine.
Percona Server has ported MariaDB code enhancement for start transaction with consistent snapshot. This enhancement makes binary log positions consistent with InnoDB transaction snapshots.
Percona Server has implemented ability to clone a snapshot created by START TRANSACTION WITH CONSISTENT SNAPSHOT in another session.
TokuDB Storage engine is now available as a separate package that can be installed along with the Percona Server 5.6.17-66.0. This feature is currently considered Release Candidate quality.
Percona Server version 5.6 now includes HandlerSocket in addition to Percona Server 5.5.
InnoDB could crash if workload contained writes to compressed tables. Bug fixed #1305364.
GUI clients such as MySQL Workbench could not authenticate with a user defined with auth_pam_compat plugin. Bug fixed #1166938.
Help in Percona Server 5.6 command line client was linking to Percona Server 5.1 manual. Bug fixed #1198775.
Percona Server version was reported incorrectly in Debian/Ubuntu packages. Bug fixed #1319670.