There is much to be said about this new release, and I hope I'll be able to play with it soon (dear Editor, don't worry: I know I have to send the next chapter first :-)). However, I think that the most exciting news is in the following Dennis words:
"your service opens at a URI on the connect.biztalk.net machines. Then a client connects to that URI and can start sending messages. We don’t want to be in the way of your app, so our relay will immediately try to establish a direct connection between clients"
See? True P2P! What are you doing still reading this post, aren't you toying with it yet? 🙂