HI
Hmmm.
The only reason to come out with a new Mac Pro at the moment would be to add the v1 Thunderbolt ports.
In terms of high end (Mac Pro) users that adds zilch new functionality at this point in time, given the state of Thunderbolt peripheral progress so far.
The replacement Sandy Bridge two-processor CPUs aren’t going to be available from Intel until Q4 2011, and they require a new CPU socket and chipset, so a complete motherboard redesign – a good time to add Thunderbolt, maybe even a faster v2 optical Light Peak option?.
A form-factor change would be easy for the Sandy Bridge Q4+ redesign, but very costly now.
FCP X/Motion X should scream on the current boxes, so plenty of wow! factor potential already at hand.
(Airs and Minis need Thunderbolt though.)