So no real IPC gain, maybe a clock speed boost (probably with weird Turbo shenanigans, so only see the gain when your using one core or something).
Nice to see 6C more or less confirmed, but if that is such a good thing or not depends on the price. It will be a regression if the entry level i7 6 core costs $440, the 6C/6T i5 costs what the previous i7 did, and there is no longer a 4C/8T option unless you jump to X299 KL-X (which is a horrible thought). Although performance wise, 6C/6T should perform more or less equivalent to 4C/8T even in multithread, I still remain skeptical (and pessimistic) that whatever we see come out of this will be for the better.
i don't know anything about what the pricing, will be but it would be typical of Intel.