In the context of covering Cisco’s “InterCloud” announcement, the following is quoted:
The Cisco Intercloud will be built upon industry-leading Cisco cloud technologies and leverage OpenStack for its open standards-based global infrastructure. We’ll support any workload, on any hypervisor and interoperate with any cloud.
You see that notion frequently now-a-days, the idea of OpenStack being part of a cloud. As I recall, Oracle said they had (would have?) OpenStack compatibility. One would expect that IBM SoftLayer (built on CloudStack) will have something in this realm of “based on” and “plays nicely with.” Of course, there are plenty of others that are “100% OpenStack” (or as close as one can get) as well.