There has to be major hardware changes in the next iPhone; Apple can't sit still in the phone market. Besides, most of it is almost a given based on component availability, pricing and other tech they've already incorporated into other device.
1. Performance enhancements
3. New I/O
I also think there is a chance for a front-facing camera. Of all companies, Apple has done the most to provide all their customers with the needed computer equipment (via iSight) to make mobile video chat a success. As another poster mentioned, I think we'll see Apple's last addition to their Windows based apps this year, iChat for Windows. With iChat for Windows, Apple will have enabled the the iPhone to be the first successful mobile video device in the U.S.
1. Performance enhancements
- Faster Processor
- More RAM
- Better battery (new tech from 17"MBP?)
3. New I/O
- Built-in Nike+ support
- Magnetometer
- Headphone based volume control support
- Improved camera
I also think there is a chance for a front-facing camera. Of all companies, Apple has done the most to provide all their customers with the needed computer equipment (via iSight) to make mobile video chat a success. As another poster mentioned, I think we'll see Apple's last addition to their Windows based apps this year, iChat for Windows. With iChat for Windows, Apple will have enabled the the iPhone to be the first successful mobile video device in the U.S.