Id say wait a bit longer if your goal is SC there is to much stuff moving around if you want to do a minor upgrade Mobo and CPU that would work. or maybe get an SSD(this helps alot). but dont go all out for a new build. check ebay in my opinion get something that works for now without to much upgrades then when SC officially out go for the big guns.Looking at the RSI Public Telemetry, if I understand correctly than a 150 score on both GPU and CPU will get me into the recommended configuration range.
My scores:
GPU - 172
CPU - 67
So if I understand correctly, my GPU is fine. I just have to upgrade my CPU and I can expect 60fps then?