Apparently, earlier today Intel confirmed that it is already working on a successor to their 8th Generation CPU's (Coffee Lake) called "Ice Lake". It is unclear whether they will be 4, 6, 8 or 10 core CPU's as Intel is yet to release any details in terms of CPU specifications apart from the fact that it will be based on a 10nm+ dye.
Read the Article Below from Tech Radar:
http://www.techradar.com/news/intel-reveals-first-scant-details-on-future-ice-lake-processors