Conroe, which is said "to offer 40% more performance at 40% less power than the Pentium D 950," is expected in the second-half of 2006. And, conveniently, Apple today announced that WWDC 2006 will take place in August...making it a perfect launching ground for a Conroe-based PowerMac (Mac Pro?).
My, my. How things just sort of fall in place.
(More new-processor details at MacRumors.)