To be launched in August/September, this new line of mainstream processors will include quad-core and six-core models with a 65W and 95W TDP. The chips use the same LGA1151 socket as the current mainstream models and will launch with the new Z370 chipset. At the moment, it's not clear whether a new motherboard will be required for Coffee Lake. This is the first time Intel will be offering six-core models for the mainstream desktop market.
The second wave of Coffee Lake processors will launch in Q1 2018, this launch will include dual-core models as well as more 300-series chipsets.
Another interesting observation is that the slide reveals a maximum of 12 cores for the Skylake-X series. This confirms that Intel's plan to launch HEDT processors with up to 18 cores is a very recent development and a direct response to AMD's Ryzen Threadripper.
Source: Hardware.info