Right here:
http://goo.gl/ajUq3
Volume 1 includes:
Requirement 1: International Voluntary Consensus-based Interoperability, Portability, and Security Standards
Requirement 2: Solutions for High-Priority Security Requirements
Requirement 3: Technical Specifications for High-Quality Service Agreements
Requirement 4: Clear and Consistently Categorized Cloud Services <which, on reading must be based on NIST's reference architecture>
...
and so on, 10 in total. I guess you're allowed to innovate under Requirement 8, "Future Cloud" development initiatives.
Greg Pfister