In order to play commercially made blu ray movies from a disc, every player that includes a blu ray disc drive must conform to AACS specifications and have a license from the AACS LLC. Starting in February of 2012, every new device that is introduced for blu ray playback must include Cinavia detection as part of the revised AACS standard. This includes both stand alone players, and software players.
I'll repeat. There is no chance that a blu ray player in the new console from Microsoft will be Cinavia free if it has a blu ray drive.
It might be possible for the console to play media files from usb sticks or external hard drives, and not trigger Cinavia found on those files. There are currently a few blu ray players with this behavior.