That is my understanding of such. The same will be true in the theatre, though. The IMAX scenes will "expand" further than the normal screen borders in the traditional theatre.
I've never seen a movie in IMAX. Saw some documentary stuff as a kid. Going to see TDK in IMAX though. Pity I can't see it at 12:01 AM for such. Ah well, just seeing it in IMAX will do me.