A whitepaper that looks at TrustZone based Trusted Execution Environment (TEE) in context of the 4 compartment security model. The second half looks at how a well designed Apps processor can use TrustZone technology and the TEE to provide a system that is "Secure by Default".
TrustZone Ready is introduced as ARM's free program that maps high level security use cases into System on Chip requirements.
A technical report on ARM TrustZone based on the development of T6:
http://www.liwenhaosuper.com/blog/2014/05/26/tee-and-arm-trustzone/