We know that Apple is going to announce new iPhone on October 4. However, it looks like an iPhone 4S release is possible as well beside the iPhone 5. Details of the iPhone 4S have been uncovered in the latest iTunes 10.5 beta 9 that was seeded to developers day before yesterday.
iTunes 10.5 beta 9 displays only two iPhone 4S models whereas four iPhone 4 models are displayed. This confirms that the iPhone 4S is going to be a dual-band smartphone, and not separate GSM and CDMA smartphones. The iPhone 4S will support both networks at once.