Apparently LTE is much easier on Verizon's infrastructure, so they might have some incentive to get people using it as soon as possible. I doubt that means early iPhone purchasers will get some sort of deal, but stranger things have happened (iPhone on Verizon, for example).
Remember everyone, AT&T 4G is just a marketing gimmick, and even Verizon LTE isn't truly 4G. Do your research before buying a phone and marrying yourself to a carrier because they're trying to one-up the other carriers and essentially just confusing the average consumer. When the real 4G debuts, prepare to have even more confusion.