Asian website ChinaDaily published one of the first reviews of Intel's Core i7-4770K "Haswell" processor. If the review accurately depicts the performance of Intel's upcoming Haswell, then the new chip will not deliver a major bump in performance. The review shows that in most application benchmarks, Haswell performs just a little bit faster than Ivy Bridge, but not much. You can view the benchmark figures over here.
Intel Core i7-4770K central processing units shows noticeable performance advantage against predecessor in Fritz Chess and MediaCoder benchmarks, but its performance is generally in line with its predecessor. The chip’s speed is behind the Core i7-3770K in some applications, including WinRAR.
Even though Intel Core i-series 4000-family “Haswell” chips do not necessarily shine in all types of tests, this could be attributed to early mainboard/BIOS revisions and/or software and drivers versions. Besides, in new applications tailored for the latest chips, Haswell will offer better results thanks to new AVX2 and FMA3 instructions.