I've got a new build planned for around november, so essentially for when Bulldozer launches. Now Bulldozer is going to be Intels SB competitor, but I have no expectations that Bulldozer will overtake the higher end chips, i.e. i5 2500k. If you look at the breakdown of cost of Bulldozers and their expected competitor (I'll try to find where I put the .jpg) then the i5 2500k is being matched with an 8 core cpu, I really don't think much will come from this.
So with that in mind I've been thinking of generation skipping. I usually build rigs with the intention of skipping as many generations as possible, with as little degradation in performance as I can. So I'll be buying an i5 2500k, or Bulldozer if it somehow beats it in gaming, alongside something like a 6870/6950, . I've no desire to buy into Ivy Bridge, yes they'll be better but the price/performance ratio of a upgrade wouldn't be worth it.
Anyone else deliberately build higher end rigs with the intention to skip the next generation entirely? This of course doesn't apply to enthusiasts, this is more aimed at performance buyers.