Oh, okay, so just to confirm this means that push servers *AREN'T* getting any information about the messages being sent to users? The contents of the message, who sent it, etc?
They don't get the contents of the message, and I don't believe (off the top of my head) that they get told who sent the message. It's just a "you received a message" notification, that the phone then has to expand into the actual notification itself by talking direct to the server.