VideoCardz.com reports that Intel’s 8-core (Kaby/Coffee) Lake chip has been spotted in the SiSoft Sandra database A quote from the article:

Intel's rumored 8-core mainstream processor has made yet another appearance at SiSoft Sandra Database. Intel 8-core processor Even though it says Kabylake, everyone knows that Coffeelake is basically Kabylake on steroids. The new processor has been tested on KBL S system (which stands for Kabylake S), it basically means we are looking at the same old LGA1151 platform. The page lists 2.6 GHz 8-core chip with HyperThreading enabled. That's rather a disappointing frequency for a new gaming chip, but this is likely just a prototype or software error.

 Intel’s 8-core (Kaby/Coffee) Lake chip spotted