The CSCC (http://www.cloud-council.org/) has launched a working group focused on Security in the Cloud. With security identified as one of the top areas of concern from cloud adopters, the working group will develop use cases keying on the security issues. The scope of the working group covers, but is not limited to private, public and hybrid clouds. Some of the initial areas to be addressed are identity and access management (IAM), security policy, audit and compliance, trust, data protection and privacy.
To add your requirements to the security working group, one can join at http://www.cloudstandardscustomercouncil.org/emails/CSCC_Security_012012.htm .