TGDaily claims (via IntoMobile.com) to have some new knowledge from “industry sources” about the upcoming 3G iPhone.

According to their sources, the 3G iPhone will indeed be introduced at Apple’s World Wide Developer’s Conference.

During a question and answer session following the iPhone Software Roadmap event in early March, a press member asked about the possibility of a VoIP (voice-over-IP) application for the iPhone. Steve Jobs left the door wide open, saying that while Apple wouldn’t allow such an application to access the cellular network, VoIP is certainly a possibility over WiFi. JAJAH has announced plans to capitalize on this opportunity by offering a native iPhone application built with Apple’s SDK this Summer. The app will work as a full VoIP client when connected to WiFi networks, and use a callback methodology (in which the user calls a designated local number and is then called back and connected to the desired phone number) when using a cellular network. The company has long offered a Web-based VoIP offering for the iPhone.

It seems like only yesterday Apple’s servers were overwhelmed by the unbridled lust of developers, feverishly downloading the newly released iPhone SDK, going offline and back again like cheap Christmas tree lights. Today Apple is reporting that over 100,000 SDK downloads have been made in a span of just four days.