One of the bigger issues is how AT&T is going to handle upgrades to the 3GS for existing customers. So far not well. Some customers can upgrade while others are denied and held to their original contract. Some have to pay full unsubsidized prices while others get the carrier subsidized price. Really screwy situation. A good synopsis of how AT&T is handling the upgrades can be found at Network World: FAQ: What an iPhone 3G S will cost you - Network World
Also, FWIW, I believe it will eventually be noted that the new 3GS is using a better chip that the Hammerhead II in the older 3G phone.
Also, FWIW, I believe it will eventually be noted that the new 3GS is using a better chip that the Hammerhead II in the older 3G phone.