they don’t have access to any new prints, and i don’t actually think they exist. it’s not that hard to get rid of fading, though, especially because technicolor prints do not fade, iirc. this particular print was very blue, but from several other color references (return of the puggo, harmy’s grindhouse, etc) ROTJ seems to be very blue in general.
the colors have been tweaked even more since that trailer. it’s a bit less green, a bit less blue and a bit more saturated in general, i think. we’ll see. that trailer was done 1 month ago, a lot has changed since.