Community Tech Preview (CTP3) build of the ESB Guidance is now available on ESB Guidance community site. This release includes many feature enhancements and further integration into BizTalk Server 2006 R2. It incorporates Windows Communication Foundation (WCF), Request-Response Messaging, and the introduction of the Resolver and Adapter Provider Framework which enables us to move more towards policy-driven messaging scenarios. Much work has also been done to build tighter integration with key SOA Governance vendors such as Amberpoint and SOA Software.
Please see Marty Wasznicky's blog for more detailed information on the new features of this release.