The 0.9.0 release includes Elasticsearch 6.7.1, Kibana 6.7.1 from upstream and the latest Open Distro plugins which include the alerting plugin, the performance analyzer, the SQL plugin and the security plugin. The Kibana UI components for the Open Distro plugins are also part of this release. You can find the details on enhancements, bug fixes, and more in the release notes for each plugin in their respective GitHub repository.
This is a companion discussion topic for the original entry at https://opendistro.github.io/for-elasticsearch/blog/open%20distro%20for%20elasticsearch%20updates/2019/05/Open-Distro-for-Elasticsearch-0.9.0-Now-Available/