We just released Proxmox VE 3.0. Its based on the great Debian 7.0 release (Wheezy) and introduces a great new feature set:

Under the hood, many improvements and optimizations are done, most important is the replacement of Apache2 by our own event driven API server.
A big Thank-you to our active community for all feedback, testing, bug reporting and patch submissions.

Release notes
Upgrade from any 2.3 to 3.0
Install Proxmox VE on Debian Wheezy