I think it will happen when B&O updates the current BV8 platform.
Look at the history
BeoCenter/BeoVision 1, MX7000 at first no surround; later the BC/BV1 were adapted so surround was possible (after pressure from consumers!!), as with the transition from MX7000 to MX8000.
So... current platform.. don't count on it. Not even an upgrade.
Future? I think there will be a chance to add it as an option when the BV8 platform gets updated...
If B&O wants to sell additional speakers (and generatie extra profit/extra margin)... then I hope there're already buzzy designing the MKII version :-)
Karel
The race for quality has no finish line- so technically, it's more like a death march.