Azure AppFabric December Release
Azure AppFabric is a part of the Azure Services Platform that provides a service bus, an infrastructure piece for connecting together different components in a distributed application, and an access control service, allowing integration of those connected components with identity providers. These services have previously been under a variety of names, such as .Net Services and BizTalk Services.
The service bus and access control service have received a December CTP update on their way to the imminent productization of the Azure platform. Breaking changes and known issues for the release are available in the release notes.