CloudStack, the IaaS cloud behind Zynga, Edmunds.com, Godaddy and 60 other of the largest clouds announced today that it was releasing as open source, all of the proprietary features that had been historically been held back.
This is an excellent move by Citrix. NASA had major issues with Eucalyptus being "open core" and not "Open Source" which was one of the main reasons they co-funded OpenStack.
With Citrix moving to commercialize Openstack, having one less variant of the software stack will mean less confusion for their customers.