I'm terrible at predictions, but:
Apple has a pattern and one of them is to add at least one desirable feature (e.g. 3G, videocam, voice input, MMS) to a new phone that the old phones don't have.
As always, Apple will claim that no other iPhone can use the feature, while jailbreakers prove them wrong within a week
So... my guess along those lines is that they're going to sneak in some kind of Siri-based voice interface that only the iPhone 5 will work with.
Apple has a pattern and one of them is to add at least one desirable feature (e.g. 3G, videocam, voice input, MMS) to a new phone that the old phones don't have.
As always, Apple will claim that no other iPhone can use the feature, while jailbreakers prove them wrong within a week
So... my guess along those lines is that they're going to sneak in some kind of Siri-based voice interface that only the iPhone 5 will work with.