XWiki Enterprise, a professional wiki that has powerful extensibility features such as scripting in pages, plugins, and a highly modular architecture, has reached version 5.3 Milestone 1.
The makers of XWiki have released the first version in this new branch, marking the start of a new development cycle.
According to the changelog, some XSS fixes have been implemented, only results from the XE instance pings and for non-snapshot versions are now counted in Active Installs, a new wiki has been created from the Add Wiki Wizard, and the Activity Stream is now empty.
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.