There is a discussion at our Support forum, where lots of concepts related to DisconnectedState (and related aspects - e.g. Session events) are explained. Another one explains what features will be supported there. If you're interested in this feature, please add your own questions. Shortly I'll be writing a Manual section covering this feature, so good questions here would help me a lot.
P.S. Here are long New Year holidays till January 10, so that's why there is almost full silence in our blogs. But some works are going on - this must be visible in update log.