according to
http://www.hardware.fr/news/lire/05-12-2007/#9264
"wolfdale will be there in january but yorkfield will be push up to end of february or march due to a bug which could crash computer. Strange thing is that QX9650 and Xeons are still sold."
hardware. fr is usually a good source of information so, I don't now what is the truth in this case.
There is a bug with yorkfield? But why QX and Xeon are still sold
The yorkfield will be late? What is the real reason? No competiton? 45nm shortage? Real bug? Problems if they kill AMD?