I would want the chalk Batman symbol with the tagline The Legend Ends. I really hope the main theatrical poster (a fire will rise) isn't used.
Batman Begins had the Batman close-up for the cover and Batman falling from the sky for the soundtrack. TDK had the Joker theatrical for the cover and the Batman theatrical for the cover also and soundtrack. TDKR might use the same for the cover and soundtrack.
Theres going to be a cover for the normal blu ray and dvd. A slip-cover design. And all of the exclusives for FYE, Best Buy, ect... The Normal release will probobly be the 3rd theatrical poster and the exclusives will have chalk design, maybe.