Yesterday Citrix announced the availability of a full featured, open source, freely available XenServer 6.2 offering. Also introduced www.xenserver.org community portal for developers collaboration and 3rd party products integration. The free, open source Xenserver 6.2 is available at xenserver.org portal, which is the same binary as the licensed version. Citrix offers a fully supported commercial option as well, which includes packaged updates and worldwide technical support and new per-socket license pricing.
Xenserver provides an open source virtualization solution that could power major cloud orchestration platforms including the OpenStack, a global collaboration of developers and cloud computing enthusiasts producing an open source cloud computing platform for public and private clouds.
In my opinion, Citrix is focusing on desktop virtualization and its supplemental network products. The future development of Xenserver platform will be in the hands of the open source community.