Developer John Heaton found some code in the latest version of iOS that hints iChat functionality could finally be coming to the mobile operating system. The code mentions various chat services like Jabber and AIM, and while it doesn't specifically mention iChat, there's certainly some strings in there that aren't yet included in any of Apple's standard apps.
We've heard rumors of something like this before -- the revamped iMessage in iOS 5 is essentially iChat for iOS, though it still doesn't directly connect to the IM services mentioned in this code. Apple may not bother calling it iChat, but it's clear that at some point, the company was at least testing more functionality on mobile.
We'll have to see -- it would be nice to have the messaging app on the iPhone send messages out to a number of different services, but obviously Apple hasn't announced any of this just yet.