Our anonymous iControl tipster has returned and tells us that a new XMPP framework has been spotten in the latest iPhone firmware. XMPP refers to the open source standard developed by the Jabber community for instant messaging. Remember back in March when Apple announced it would support native instant messaging? In a nutshell, it looks like Apple's new iPhone-based chat will be built on Jabber/XMPP.
Unfortunately, we're told that this XMPP support remains in a private framework and will not be available to 3rd party SDK developers. Apple has made a strong commitment to sand-boxed development, allowing developers little access to the underlying OS and frameworks. Single-purpose apps like games should thrive in this development environment while less bounded utilities like social networking apps may struggle--or at least have to depend strongly on web-based servers.
TUAW reader
varun submitted a good question for an Ask TUAW session on the topic of multi-network chat clients. varun has tried out
the likes of Fire, Adium and Proteus, but hasn't come up with a compelling reason to use one over the other. 
