Sorry but every other company is not waiting on intel.
Apple hasn't released an updated mac pro in 15 months. No other PC manufacturer has done this.
All an updated Mac Pro could have been was with slightly faster graphics cards (6000 AMD series), slightly faster processors (3.2x4, 3.2x6, 3.46x6 and 3.06x12 replacing 2.8x4, 3.2x4, 3.33x6 and 2.93x12) and thunderbolt.
The benefits would be a sales increase - but it is now assumed by most that sales of Mac Pros are very small. So I very much doubt it would be enough to pay for the development and manufacturing change to include thunderbolt and graphics driver development. That is assuming that they will still be separate entities rather than requiring a custom graphics card to include thunderbolt within Apple's design. The CPU upgrades might not cost any more, depending on Apple's deal with Intel, but such an upgrade also makes all current inventory old stock. Driving down the price. It is much better for Apple to only update at Intel ticks and tocks.
As for those advocating a move to non-Xeons or using the LGA 1155 CPUs that are already out, well no current Sandy Bridge processor and chipset is superior to what should be in the base Mac Pro model (3.6GHz 4-core with quad channel memory and 40 PCI-E lanes). So where would the up sell come from? It would mean they were either stupidly expensive or compete more with the iMac pricing. They aren't going to further divide it.
I think what a lot of people fail to realise is that Apple don't intend Mac Pros to be purchased by the average consumer, nor gamers who can get similar performance, nor hardware enthusiasts. They are for use in professional type work-flows and here purchasing considerations are different.