I find this quote very interesting, for anyone that thinks there will be a big IPC increase, it's not going to happen. They were throwing around numbers, like a 30% increase, and a 15% increase.
"While Intel's big news today is the announcement of its 18-core, 36-thread, high-end desktop X-series processors, the company has revealed one detail for the 8th generation mainstream processors, codenamed Coffee Lake, that are due to be released later this year: the new chips will, at least in some particular circumstances, be 30 percent faster than 7th-gen Kaby Lake parts.
That's a huge generational improvement, but of course, there are footnotes to consider. The 30 percent boost came in one benchmark—SYSmark 2014 version 1.5—and applies to 15W U-series mobile processors. The comparison pits an i7-7500U (2.7GHz base, 3.5GHz turbo) with two cores and four threads against an unnamed next generation chip. The new chip has an unspecified base clockspeed, a 4GHz turbo, and doubles the number of cores and threads to four and eight. The 8th generation chip is built on a refined iteration of Intel's 14nm process."
So it seems that doubling the number or cores and threads, and boosting the turbo speed by 500MHz offers a 30% increase in performance using the synthetic benchmark SYSmark, well no freaking **** Sherlock.
14nm++ Coffee Lake = Kaby Lake = Skylake = waste of time for anyone unless you are on Socket 1150/55 or older, since the only real new tech is going to be the six core offerings, which won't fit in your Z170/Z270 boards by the look of things.