You people just don't get this, do you?
Apple _ Does _ Not _ Make _ New _ Products _ Bigger
I think Apple will continue in an old Steve Jobs tradition: Apple will _never_ do many things. Until they do them.
Now with the screen size, what should be obvious is that some people prefer a smaller phone, and some prefer a larger phone, and the first group think that smaller is better, and the second group think that larger is better. A much large screen on the iPhone 5 would make some people happy, and it would make some people unhappy. Apple probably has some idea which group is bigger. Competitors will want to build phones with a size that is _different_ from the iPhone size, whatever the iPhone size is, because that way one of the two groups will prefer their phone.
Since Apple has been selling 37 million iPhones in the last quarter, they could probably produce an iPhone 5 (old size) and an iPhone 5 XL (identical in any way, except with the biggest m*********ing screen of any phone around).
Actually, Apple is largely concerned about sustaining and surpassing earnings over the year. To do that, product announcements have to be spread out over the four quarters.
Excuse me, but that is total nonsense. If there is one company that has demonstrated for the last ten years that they don't give a damn about earnings and pleasing the stock market, it is Apple. (That's the paradox that many CEOs don't get, that the more you try to please the stock market and not the customers, the less success you have in the long run).