According to a report on iMore today, Apple could be planning to replace its 30-pin dock connector for iOS devices with a much smaller “micro dock”. iMore says that according to its sources, Apple is looking to create more space inside the iPhone 5 for components that it considers more important, such as a bigger battery and a 4G radio, to name but two. Although this would be a big change, and might upset some users, iMore notes that to make such a move is far from unprecedented for Apple, citing its switch from the mini SIM to the micro SIM, and it’s re-siting of the iPhone 4's antenna around the sides of the phone as two particular examples. iMore says that Apple is probably more likely to make such a design change now than previously because of the diminishing importance of the dock connector, with the current generation of iPhones being much less reliant on the PC, thanks largely to the introduction of AirPlay and iCloud.
Source: Apple getting ready to ditch the traditional iPhone, iPad, and iPod dock connector | iMore