The iPhone, no matter what anyone says, will always be a well-made, fluid device. I came from the iPhone 4S to "my precious", my GS3. I believe the new one will have features that we haven't seen yet that will be limited to the iPhone 5. I like the look, even if I think it's a little tired now. Hell, all cell phones are essentially evolving looks over the years but I'll give Apple some credit for creating what, at the time, was different. But now I think it's a little long in the tooth, definitely evolutionary not revolutionary. A month ago I would have called it a bluff, but since it's been assembled with parts available, I'm not so sure- I think it's the next iPhone. It'll be interesting to see what kind of engine is under the hood. I'd consider buying it if the display were truly larger, not just lengthened. I am now forever a fan of larger displays and I think from what I have seen of Jelly Bean, it looks like Google has finally found its fluidity.
The best thing about people switching from iPhones to other devices is the fact that it forces Apple to consider why people are leaving and why Samsung had some truly phenomenal sales figures. Two guesses really- fewer people want to buy a 4S given the closeness of a pending iPhone release and are willing to try something different, or folks think that iOS has grown a little long in the tooth and are wanting some features that are available on Android. Or, once the new iPhone drops a huge amount of people are going to upgrade. I think that's a given but I would be surprised to see the sales figures eclipse that of the S3.