I too am going to wait on the object based codecs until I see them become mainstream. One of the questions I have is how a room correction scheme will deal with a sound field specifically designed to place sounds where speakers don't necessarily exist. I would think that if the engineers place a sound directly in front of the screen they would have to employ some sort of "phantom" effect to get it there. Since the specs don't actually say exactly where to set your overhead speakers I would think there will be some wiggle room where the sound comes from. Of course this could be affected with how the speaker setup algorithm sets distance and delays.