I have that box. It's meh. It's not bad, but not great. The bonus goods are decent enough, but not worth $75. I think I got mine for around $50, but even that's pushing it, seriously. That DVD is the SAME DVD you get outside the box. Crappy Warner Brothers crapboard package.
The bonuses are the cel, a poster, the big ass box and what amount to little photos from with scenes from the film. Really not worth the money if you ask me.
As far as the complete collector's edition, I have to agree in that it's probably never coming. Isn't the problem that the people who now own the rights hated the film? Something about they fronted money for the movie and said that if it went over schedule the rightst became theirs? The film went over schedule, and the theatrical US release became theirs, but the other versions did not (like the UK version)?