Here's a thread I posted a month ago.
https://forums.macrumors.com/threads/655689/
https://forums.macrumors.com/threads/655689/
I think their major pitch will be software related. So many of the complaints have been about this. I think Apple will release the 3.0 software, where they'll integrate Copy & Paste, MMS, stereo bluetooth, Video Recording, landscape texts/emails, background apps, and I think they'll loosen up restrictions on the SDK. People have been begging for most of these things from the start, and Apple is going to advertise this as Incredibly more awesome iPhone.