Its most likely the next gen iPhone will be introduced on the WWDC 2010, so its not surprising to see next gen iPhone parts are showing up on the internet. SmartPhoneMedic has created a movie where they show iPhone parts of the next gen iPhone. They show the assembly of the new iPhone 4G LCD and digitizer onto the metal middle plate and a tray for the micro-SIM.

Source [SmartPhoneMedic via tipb]