The Concurrency and Coordination Runtime have been released. You can find it here, as a part of the new Microsoft Robotics Studio.
I gave my take on the significance of the CCR when the Channel 9 video was posted (see
CCR SDK and more benefits to .NET with links to the Microsoft content).
I keep a list of topics into which I plan to do a “deep dive”. The CCR just got bumped to the top of my list.