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The ideal chip to use for LTE, the Qualcomm MDM9615, isn't officially available for OEMs until Q2 2012, so it's possible they talked to Qualcomm to get it early, but since it's built on the brand new 28nm process from TSMC, I don't expect a ton of chips to be available, at least not at te massive scale Apple requires. If it does use that chip, I strongly suspect that an LtE iPad wouldn't be available for a month or more and that the WiFi version would come out sooner. Or perhaps there will be a WiFi+3G version for countries without 4G for a total of 3 distinct models, but that seems rather complicated. Certainly, the CDMA-only version will disappear.