I hope that the delay of the new MacPro will mean that there is more to the upgrade than a 6core-for-4core swap.
With every Tuesday our expectations get higher because we figure out that Apple is actually doing something to improve the MacPro be it USB3 or SATA6 or something else.
I was about to pull the trigger and get a $6000 machine with liquid-cooled and overclocked Gulftown (4.3GHz), 24GB DDR3 1600MHz, Intel G2 160GB HDx2, NVidia GTX480 and GTS 250 (for the hackintosh part) but at the last minute I did not go through as Apple would probably announce an awesome MacPro the second my credit card it charged.
So I am waiting for another couple Tuesdays...