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i7 CPU's as you know it currently (920, 940, 950, 960, 965, 975) might not be all around by the time Jan comes next year. Instead the i5 variant socket with i5 and i7's will come out that will partially replace the current i7 line, and the current i7 line (socket 1366) will be supporting the old Xeon's for it as well as the new 6 Core variants on the 32nm process.
So for performance wise, Q6000's to Q9000's was 10-15% increase in performance per clock. Q9000's to i7's was another 10-15% increase in performance. Give or take a bit depending on the benchmark.
Sounds about right, even conservative. Going from my Q9300 to 920 has made a massive difference, it is much much faster in everything I use it for, gaming included.