The Xen Project 4.6 release incorporates many new features and improvements to existing features.
For a description of Xen Project 4.6 features see the Xen Project 4.6 Feature List and the Release Announcement.
For system limits and headline features also see the Xen Project 4.6 Feature Matrix.
Xen Project 4.6 Release Notes
For Xen Project 4.6 documentation see
For a breakdown of contributions to Xen 4.6 check out the Xen Project 4.6 Acknowledgements.
Xen 4.6.0 (hypervisor and tools) official source distribution