Did you happen to see Ebert's show last night? I rarely watch it, but caught it just as they 'pre' reviewed ROTK. The dippy younger guy says he wasn't a Tolkien fan - no surprises there - but he said that now having seen the whole trilogy the first two make so much more sense and as a complete film, he really liked it.
Ebert said basically the same thing, very good review for ROTK and that all together the films were 'legendary' filmmaking.
Yeah, looks like Ebert will give it 3.5/4 and he didn't really have any problems with it. All the NY papers and the LA Times have given it rave reviews now too, and in fact on MetaCritic.com ROTK is currently the most critically acclaimed film of all time on the same score as The Godfather at a perfect 100/100.