Confluence 5.9.1-Beta11 is now available! This release is a snapshot of our work in progress, primarily focused on allowing Confluence users to see the new features in advance. This also provides Atlassian with useful feedback. EAP releases also give plugin developers an opportunity to test and fix their plugins in advance of an official release. 

Read more in the Confluence 5.9.1-Beta11 Release Notes and get the release from the download site.