So there were two things I find exciting that got merged in gabble 0.9.12 (gabble is Telepathy’s XMPP/Jabber connection manager). First was support for SASL authentication channels, allowing you handle SASL auth mechanisms from a custom handler (e.g. by not supplying a password to Gabble, or a custom mechanism such as X-GOOGLE-TOKEN or X-FACEBOOK-PLATFORM); thanks to Eitan. Second was multi-user Jingle calls; thanks to Sjoerd.
This is all done as an extension XMPP/Jingle using a XMPP multi-user-chat room (the XEP). The work has not been integrated into Empathy yet, but there is a demo client (yes, it even works from Australia). Sjoerd writes more about it on his new blog.