Here is what I really think happened (and granted, I have not opened up the phone to see what is what yet):
-Apple decides to put in TWO different cell technologies into a phone to save manufacturing costs that only had one or the other in the past: CDMA and GSM.
-This is the major difference other than the main chip from the 4 and the 4 is not half as bad as the 4S in battery problems...my old 4 is still doing quite well not being on a charger for three days.
-The battery is now powering TWO different cell antennas.
-If the battery was exactly the same as the 4, then this is our drainage issue and Apple's only solution will be to find a software switch to turn one of the antennas OFF.
-Even if they incorporated a new battery with a somewhat higher capacity, it was not strong enough to handle the draw for two antenna aseemblies.
I am on AT&T, why do I need the other antenna on at all, ever? Verizon's customers may need it for travel.
-The other options are worse
-they have a defective antenna assembly that is quickly draining batteries on most phones around the world
-they have a massive set of batteries that are defective
-or both
Now some more illogic from Apple: If it was software, why are they instantly replacing so many phones? Is this just to appease us and/or to end with the perfect excuse to remanufacture phones for Applecare replacement as this looks like its going to be replaced, a lot.