Dupree points to “some pretty definitive evidence that future iPhones and iPads will have video chatting capability… Icons were found in the 3.2 SDK which seem to indicate that there will be video calling on a future iPxxx device.”
Also, Dupress reports, “Hidden in some of the underlying iPad telephony apps are some VideoChat strings that are equally, if not more, telling evidence of future VideoChatting capabilities… Also, we’ve found some references to ‘iChat.'”
Full article, with screenshots, here.