Intel Coffee Lake:

Intel’s Coffee Lake series CPUs consists of 6 c ore and 4 cores Chips using the Z370 chipset.
These CPUs were supposed to be launched for the mainstream market.
This new family of 8th Gen CPUs will not be compatible with the LGA 1151, however, the LGA 1151 will need some changes to support these Chips eg LGA 1151 V2.

Intel Coffee Lake release:

These 8th gen Coffee Lake CPUs are delayed to February 2k18.
The report also indicated that the company had been attempting to push the launch to the second half of this year.

Specs:

CPU Intel Core i5-7600K Intel Core i5-8*** Intel Core i7-7700K Intel Core i7-8***
Family Kaby Lake-S Coffee Lake-S Kaby Lake-S Coffee Lake-S
Process 14nm 14nm 14nm 14nm
Cores 4 6 4 6
Threads 4 6 8 12
Base Clock 3.80 GHz 3.50 GHz (ES) 4.20 GHz TBD
Boost Clock 4.20 GHz 3.50 GHz (ES) 4.50 GHz TBD
L2 Cache 1 MB (256 KB per Core) 1.5 MB (256 KB per Core) 1 MB (256 KB per Core) 1.5 MB (256 KB per Core)
L3 Cache 6 MB 9 MB 8 MB 12 MB
Unlocked Design Yes Yes Yes Yes
Socket Support LGA 1151 LGA 1151? LGA 1151 LGA 1151?
PCH 200-Series 300-Series 200-Series 300-Series
TDP 91W TBD 91W TBD

 

Conclusion:

Intel has always been the king of CPU market and surely want the things to stay the same, However with the AMD stepping up and producing quality stuff at the most reasonable prices has made the intel to rethink their strategy of making and Launching their new CPUs.
And with the upcoming launch of the Behemoth Threadripper, Intel seems to have lost it and trying to regain its glory.
Anyhow, we will see what the enthusiasts and professionals recommend and what the upcoming reviews say about it.