Product road map slides for Intel Coffee Lake show a 95 W six-core CPU, and two new motherboard chipsets, Kaby Lake Refresh and Cannon Lake. The slides show Socket 1151, but there may be chipset limitations that stop Coffee Lake from being backward compatible.
https://www.notebookcheck.net/Coffee-Lake-product-roadmap-shows-six-core-CPU-using-Socket-1151.240030.0.html