For TPM one or two whole scenes and certain vfx elements were shot using an earlier version of the digital camera, so those parts are locked in 1080p too. I just never liked that for menace they scanned the film, then did everything digitally, then made the dvd from a print master instead of directly from the digital files. I guess they thought it would make for a more uniform look, but if they were going for preserving the film look then why not do the same for 2 and 3. It will be interesting to see what is done for the official bluerays.