The only things you can say for sure are
1) The new MPs will be faster then the previous gen.
2) The new MP's will be more expensive then the previous gen (the pricing on the minis seems to indicate that non-US customers will be hit with a larger increase.)
3) People will rant about the price and
a) say they are getting a PC
b) say that they are building a hackintosh.
c) scramble around to buy last year's model at a small discount.
d) not get the new MP which they have been waiting on.
The new MPs will come out and most people will not be happy.
I agree and unfortunately think I may be one of those people.
I'm in a tight spot with my dual G5 dead on its second motherboard.
When PC manufacturers are including an i7 980x 6 core for around 2k that is relatively easy to overclock to 4Ghz and one has the all the GPU options, like the Nvidia 485, man, Apple looks lacking.
My bet is the 6 core will start at 2.66ghz around $3299 which is crazy, especially when the 3.33 ghz is what you need to compete with last years 8 core models.
On cinebench, only the overclocked 4 ghz chip was outperforming current 2.93 octo's.
We all know software still, and ESPECIALLY FCP, is having a hard time tapping into all the cores. Apple needs to be giving its customer's the upper Ghz clock speed, fast 1600 mhz ram and needs to drop Xeon from single socket desktops (that would save a lot of money on our end).
At the end of the day, we are talking about Apple being extremely expensive, and I am a fanboy. All I know is that the octo's in 2008 were a great deal if you looked at performance per dollar even compared to PC workstations.
With the advent of the i7, PC desktops now have the performance of workstations for half the cost.
Apple needs to have more of a "desktop" Mac Pro - the current ones are all the pricing of workstations.