This is interesting because in Japan, NTT DoCoMo is one of the major carriers not to carry the iPhone while their rivals KDDI and Softbank do. One of the reasons why Apple has not given in to an LTE capable iPhone is because of how the design of the LTE chips forced them to compromise their design, and if anyone has read the Steve Jobs’ biography, you’ll know that when it comes to design, Apple (or rather Steve Jobs) does not compromise.
However given the advancement of our technology, it is possible that LTE chipsets have been reworked to the point where Apple sees fit to release an LTE capable iPhone/iPad. It goes without saying that if Apple were to launch LTE capable iOS devices in Japan, those of us living in North America are more than likely to get them too especially given AT&T and Verizon both have LTE networks in place, with Sprint expected to roll out its own next year.
Until we actually see an LTE iPhone/iPad announced by Apple, we suggest taking this piece of rumor as it is for now and not place your hopes for LTE iOS devices in 2012.