Just a quick announcement that a vCloud Director Object Storage Extension Reference Design that I wrote is now available at this link.
It deep dives into the use cases, architecture, includes recommended deployment options and description of the new feature of 1.0.1 related to multisite deployments. There are also results of performance tests of the overhead the extension adds over the direct use of the native storage platform.
Tom Fojta's Blog 
Hi Tom,
Do you know if any other object storage solution (Scality, Netapp …) is planned for integration ?
Thx
Yes, the next release will add new storage providers.