The native support for foreign key constraints has been one of the most requested additions for MySQL Cluster, and means that MySQL Cluster automatically enforces referential integrity between tables.
The new version includes an auto-installer that Oracle says lets you graphically configure and provision a production-grade cluster in minutes, automatically tuned for your workload and environment, directly from your browser. The SQL layer of MySQL Cluster is based on the latest MySQL 5.6 GA release, and lets you combine the InnoDB and MySQL Cluster storage engines side by side within a single application using the latest MySQL 5.6 release.
The new version also promises to deliver from one and a half times to seven and a half times higher throughput per connection to the MySQL Custer data nodes, increasing the overall capacity and scalability of the cluster. The improvement is achieved by splitting mutexes within internal connection APIs, and is completely transparent to applications.