IMAX has announced that they will have a new 12 channel discrete sound system deployed along with their new Laser system which was demonstrated early this month (Nov 2013).
Given their relationship with Barco this is likely a re-badged Auro sound system.
Here is the reply from IMAX to the question of whether they were evolving their sound system.
Dear xx xxxxxxx,
IMAX is currently in development for its next-generation laser projection system, which will feature a new proprietary sound system upgraded to 12 discrete channels plus sub-bass to produce an auditory experience that is even more powerful and precise.
In the new systems, the additional side channels will supplement IMAX’s ability to reproduce sounds originating from points in between front and rear loudspeakers while the additional overhead channels will improve the system’s ability to position sounds above the audience. The result will be the most visceral sound experience available.
IMAX is also committed to providing a consistent quality sound experience. The new system will feature IMAX’s patented automated multi-point tuning process that ensures each system is optimized for the specific auditorium in which it is installed and runs a daily calibration test using high performance microphones permanently located within the theatre to ensure the audio system is always running at peak performance.