The comparison for Touch of Evil says the US edition is two discs. I don't have the limited edition we currently have profiled, but a later rerelease. Mine is all on one disc. From reading reviews and such, I think both US releases are the same except for the limited edition having a slipcover and a physical copy of Welles's memo, though.- The contents are right, but the claim that they are split across two discs seems to be a mistake.
http://www.blu-ray.com/movies/Touch-of- ... 20/#Review