The main reason I'm asking is because in the 972 thread at AVS Jeff said that the 972 would get Dolby IIz but not Dolby Volume.

Not sure whether that's because of hardware and/or s/w limitations.

I suspect it's the DSP processing power, in which case we're out of luck, but if not I wonder if some of the other surround modes could be sacrificed to make room for Dolby Volume.

I consider the latter an extremely desirable feature, the lack of which is the only reason I might end up getting something with Audyssey.