Release Notes: This is a major bugfix and maintenance release. Upgrading is recommended. It fixed foreign keys support (multiple issues), a possible crash in tables without a primary key but with a unique secondary key, a crash with DDL in multi-statement transactions, a blocking problem in RSU DDL, a failure of MySQL slaves to start if no wsrep provider was loaded. It added automatic GTID recovery after a crash by mysqld_safe, xtrabackup SST support, and an update to MySQL 5.5.28.
Release Notes: Galera Cluster for MySQL milestone 1.0 reached. New in this release: support for both MySQL 5.5.15 and 5.1.58, on-disk writeset caching, strictly synchronous reads, improved stability in WAN, and Severalnines' ClusterControl(tm) GUI configurator and monitoring tool.
Release Notes: This is a major update over 0.7. Changes include improved flow control, parallel applying, configurability, scriptable state transfer, and notifications. The 0.8 series is protocol incompatible with 0.7 but retains most of the configuration options.