minus me all you want, but the difference experienced by most users between the 4 and 4s is minimal. 2x faster processing and 7x faster graphics..to actually experience the difference you need to be doing more than texting, surfing, listening to music, and watching video. even most of the games do not stress out the processor.
those who bought the 4S did so to 1. have the latest technology 2. were at the end of they contract 3. needed Siri/better camera.
my take on the entire situation, was Apple tried for those extra three months to push out the iPhone 5. 4S was their backup. There is no reason to delay the 4S by 3 months just to upgrade the processor and camera.
look at Siri. Its beta...the 4S killer app...in BETA. Had the 5 come out, we still would not have Siri. Without Siri, the 4S has not marketable characteristics.
again that is my take, and so, do not be surprised when an iPhone 5 with redesign is released in June.