For those concerned about the LTE version of an iPhone, the chip needed to do dual voice and LTE doesn't exist yet. The technology hasn't been advanced yet; the only way to get around it is to use two chips and since broadcom produces the LTE chip, it requires for the use of their snapdragon series of processors. Obviously apple isn't going to pass up the use of their A series chip (based on the ARM specs).
The timeline for the chip apple needs is for it to hit production in the 2nd quarter of 2012 which would be on par for the next refresh.
I'm not sold on LTE just yet. When the technology advances to a point where it doesn't suck all the battery life out of my phone in half a day, I'll consider it worthwhile. Until then, I see no reason for "super fast" internet on a phone.