While there is no guarantee that Apple will actually make a phone this large, it is encouraging to know that they are at least looking at a design that is bigger than the current iPhone 5.
Personally, I have a tiny iPhone 4S and my contract is up in October. Actually, I had offers to trade it in earlier, but decided against it. In the new age of LTE and having a fast connection all the time, my desire for a larger iPhone has only increased.
As I have explained on my Mac Attack page, I switched to using Mac computers after I bought my first iPad (the Original). My enthusiasm for Apple was at an all time high and my love for their ecosystem only solidified that opinion. I still love their ecosystem, but their choice of going with a thin "bookmark" (per David Pogue) design for the iPhone 5 was a disappointment.
While I wish that a bigger size was coming out this year, it isn't supposed to happen. As a result, I have decided to wait until 2014 to see if they increase the size (width). With Siri, is it really all that important to be "one hand" friendly? I personally don't think so. Personally, I use my iPad more than my iPhone and I can' t remember every wishing I could stretch my thumb all the way across the screen. Unfortunately, if they stick with the "bookmark" design next year, I am going to switch to one of the new phones from another company. Apple knows that many of their clients want larger phones, so I expect them to make one.
By the way, I don't know if a 6 inch phone is too big to fit in a pocket, but I suspect that Apple knows that it will need to fit in a pocket if it is going to be popular. Also, some people will say that they followed other companies that make larger phones, but I really don't care. They just need to make a better large phone... The last time I checked, they didn't invent the smartphone, either. They just made it better.