From the photos I've seen of the theater, it doesn't look like the screen is particularly large. A 2k dcp from the 1920:1080 lowry master would probably still hold up rather well on that size screen and get the "wow, amazing" reactions posted on facebook yesterday.

Yeah, it was always highly unlikely that a brand new 4k transfer of any version of Star Wars was gonna debut under such circumstances.

The footage in RMW's reel does appear to be from the new scan. There's also footage of True Lies and The Abyss, which we know got new transfers for their long-awaited blu-rays later this year. Maybe the respective companies didn't care one way or the other about RMW showing off their hard work using footage from their movies, even though it kinda/sorta "spoils" whatever grand unveiling they might want to do later on in the form of an actual trailer, tv commercial or whatnot.