Zero improvements in skylake-X from haswell and broadwell for gaming, even for multicore aware games:
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Skylake X does overclock higher but then you have to tackle the monstrous heat output with very expensive cooling solutions. I dont think there are motherboards up to the task yet. those might come later.
This is a poor showing for Intel. Im so glad I went R7 from my 2500K and didnt wait for these I9's.
I would wait for Coffe lake, those promise more for gaming (6 cores 12 threads and a better suited L1/L2/L3 cache system). If you cant wait just go AMD (best CPU is 1600 right now) and use the savings to get a better graphics card.