I'm expecting Ivy to be over 50% faster than my i7 860 on the same or even lower power budget. I tend to upgrade my primary PC's stuff (cpus,gpus) when something 50% faster on the same price budget comes along.
So I'm guessing that come Easter, it will be getting a 3600k and two GTX 670s. That should do the trick of 50%+ more performance overall, over my 860 + GTX 570s SLI.
Now if Intel and Nvidia decide to place these products on a much higher price ballpark, I will not hesitate to cancel the whole thing. I upgrade mostly out of enthusiasm most of the time and not out of need. My 3.5yo Q9550@4Ghz, being hosted on my secondary rig, still holds its ground in most recent games anyway.