Already heavily in Internet rumors emerged about the existence of the iPhone OS version 4. In some of them say that the mobile device will have a front camera for video calling. Other rumors do say will be increased capacity on the phone.
There is still no accurate data for hardware changes, but it appears evidence of testing of the new OS. In the photo below clearly visible versions was released so far.
Currently, it is clear only that from Apple only tested the new software and (most likely) hardware without clear indications of when it will appear on the final version.
Typically, from Apple to announce new models in January and put them on sale in June. It is expected the company to continue its traditions.