Apple officially introduced the iPhone 4S.:

iPhone 4S. Outside the same, inside all different. A5 chip inside, dual-core graphics up to 7x faster than iPhone 4.

8 hours of talk time, 14.4 HSPA+, Antenna improved, World Phone. 8MP Camera. Other notes: 

– World phone…both CDMA and GSM in one phone. 
– Wireless system updated. Stainless steel band with two antennas, switch intelligently between them. 
– Data speed twice as fast…14.4 Mbps HSDPA. It’s what competitors call 4G. 
– Camera: backside illuminated sensor, hybrid IR filter, better color accuracy, 5 element lens 
– Face detection, better white balance, and fast photos. Time to first photo: 1.1 seconds. Half a second for next shot.