Yeah, the color footage is definitely from the ShoWest trailer.
Hmm, OK thanks, but what was exactly shown at ShoWest convention in 1982? A full workprint or just few scenes? And in case, are the YouTube scenes all those shown or there are more?
By the way... isn't this convention the one Larry Nemecek is doing a full documentary about? (http://www.larrynemecek.com/conwrath
And also isn't again a ShoWest convention (more precisely in 2009) where the first J.J. Abrams Star Trek was shown un-announced before the official premiere? Brought in person by Leonard Nimoy? Instead of Star Trek II - The Wrath of Khan?
Lucky fans those who live there.