It's a tick-tock cycle. 3G, 3GS, 4, 3GS. Most people who bought iPhones did so on 18-24month contracts. Apple have good brand loyalty. Thus, people with 3GS will make up more of the market for 4S purchases than 4 owners who may still have many months left to go. No need for complete dock/case redesigns after just a year. Also bar the exterior design everything about it is improved, and Siri is pretty nifty. As a 3GS owner I look forward to getting it, and am in a position where I can just buy the handset from Apple and use it with a cheap pay monthly plan I already have, then sell it and get the next iPhone in 2012, which will be where a big redesign appears no doubt. If the 4S had been in a new shell people would be wetting their pants, but it appears a lot of nerds are fickle and are upset they've kept the design the same (despite Macs looking the same every year for ages).