It looks like Intel is pushing forward their X299 Chipset release with alongside it Core X processors. The announcement would be May 30th with availability June 26th opposed to a release in August.
The X299 chipset will be compatible with Skylake-X and Kaby Lake-X Intel Core X series processors. Skylake-X and Kaby Lake-X, will include 12, 10, 8, 6 and 4 core products. That 12-core version is a new one and seems to be a bit of a panic reaction from Intel towards AMD who might be releasing 12 and 16 core parts. Link