I'm personally uncertain about the 370 platform for the mac, since intel is going to release z390 in the second half 2018.. which coincides with updated macs.. so I'm afraid apple will skip 370 completly and never fully support it..
I'm also waiting for first brave testers as I urgently need to build a system.. so it's either going to be z370/8700k, x299/7820x, or the safe bet z270/7700k..
let's hope for the best.. coffee lake would be a great cost/performance chip.. if it performs on a mac that is..