SUSE Cloud, as the OpenStack distro is called, has been in preview since last October, and that particular preview build was based on the "Diablo" OpenStack 2011.3 running atop SUSE Linux Enterprise Server (SLES) release 11 SP1 with Xen hypervisor partitions for virtual server instances.
The production-grade SUSE Cloud pairs up SLES 11 SP2 with the "Essex" OpenStack 2012.4 - which as the release numbers suggest came out this past April. SP2 came out in February this year sporting the new Linux 3.0 kernel and support for all of the latest and forthcoming x86 processors from Intel and Advanced Micro Devices. The production release also supports KVM as well as Xen at the hypervisor layer.
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