CJ 4DPlex, a Korean based company, announced bringing 4D films to LA Live's Regal Cinemas by this Summer. 4D allows unheard of features in cinema in the US. These features include wind, rain, motion, strobe, fog, vibration and smells. The closes we have to these features are D-Box seats sprinkled around Los Angeles that allow motion and vibration.
In my own D-Box seats experience the seats were not worth the extra money.
No actual time-frame was put up as to when or what films we would be available to watch. The only major release to use this system so far was Iron Man 3