The sales VP just sent me this.
The 2.1 board is already installed in the ACT 4 and Muse processors. We are just waiting for the firmware to be released by MDS.
DTS X Pro and IMAX will be available late 2nd or early 3rd quarter.
It looks like the Acurus ACT 4 might be be my choice. Was the setup and manuel speaker calibration not too complicated?