Wccftech is reporting that coffeelake support maybe extended to 100 and 200 series motherboards with a supporting BIOS update from the motherboard manufactures (obviously read this with a pinch of salt).
The chip will be compatible with the LGA 1151 socket and rumors are that board makers will extend support of Coffee Lake onto 200-series and even 100-series platforms. The chip will be Intel’s first hexa core product and will be based on the 14nm process node.