Anyone who doesn't acknowledge that a 5.5" is currently in the production pipeline simply isn't paying attention.
But the million dollar question is, will it be out this year along with the 4.7"? I personally think that Apple would release both, they have shown that they are willing to release two models (5S and 5C) also it's a good thing by giving customers a choice between the 4.7" and the 5.5" iPhone