No, it won't, because LTE is a bigger priority for sales and Apple is all about battery life, which will go down the drain if they use a Quad Core CPU. The graphics may be Quad, but the CPU will remain Dual Core.
I really don't know why you guys think it will be Quad Core, especially considering that the phone will be thinner, as well.
I really don't know why you guys think it will be Quad Core, especially considering that the phone will be thinner, as well.