According to iMore’s sources, the next-generation iPhone will debut some time this fall (presumably September or October) and it will be equipped with 4G LTE capabilities.
So to sum up, iPhone 5,1 is on track for:
- Similar if not same sized screen (currently 3.5-inch but not set in stone)
- 4G LTE radio
- New “micro dock” connector
- Fall/October 2012 release