I'm kinda tired of all these rumors & speculations. Why would Apple make a mini-iPhone or change the screen size? All the app developers would have to accommodate.
It's much more plausible that they develop the near-field technology, expand space, better camera, CDMA/GSM hybrid, faster processor, like they've done every time in the past.
Personally I'd like to see a temperature sensor and pressure sensor, since the Android OS allows this kind of stuff but has yet to be built into phones.
which tempurature, your hand your pocket, the processor? a thermometer on a device that generates it's own heat is kinda difficult unless you wanna hang around for ages whilst the isolated sensor attains the ambient temp whilst your tryin to hold the thing.