TechPowerUp posted a review on the Intel Core X HEDT Processors and X299 Motherboards Release Schedule Detailed
A quote from the article:
Intel announced the release schedule of its Core X HEDT (high-end desktop) processors and compatible socket LGA2066 motherboards. The first wave of Core X processors, which includes two quad-core SKUs, and one each of 6-core, 8-core, and 10-core (detailed in the table below); will be available from 26 June, 2017. Pre-orders for these chips will open from 19 June, on popular online stores. The first wave includes the quad-core Core i5-7640X, and Core i7-7740X "Kaby Lake-X;" six-core i7-7800X, eight-core i7-7820X, and ten-core i9-7900X "Skylake-X."Intel Core X HEDT Processors and X299 Motherboards Release Schedule Detailed @ techPowerUp
Intel plans to release the Core i9-7920X 12-core processor some time in August 2017, followed by 14-core, 16-core, and 18-core parts by October 2017. A large selection of compatible socket LGA2066 motherboards based on Intel X299 chipset, will be available for pre-order on 19 June, followed by retail availability from 26 June. With socket LGA2066 having a similar cooler mount-hole layout to the current LGA2011v3 socket, most current coolers which can cope with thermal loads of Core i7 "Broadwell-E" processors should be able to handle the Core X "Skylake-X" and "Kaby Lake-X" parts being launched this month.
