The extreme editions of the two families, Skylake-X and Kaby Lake-X was earlier expected to be released in May/June with Skylake-X debuting at Computex.
However, this seems to be not the case as reports suggest that Intel has pushed the release to August/September timeframe instead.
August release, being a possibility, may coincide with Gamescom in Germany which would perfectly make sense. Rumor suggests that Intel has been tweaking the cache sizes of the the two processors which could enhance the performance.
The Skylake-X offers 10, 8 and 6 core processors while Kaby Lake-X sticks with the quad core part. The TDPs of the processors are 140 Watt and 112 Watt respectively.
These new processors will require the new 2066-socket which will be featured on the upcoming X299 chipset. The new chipset also offers support for Intel Optane and quad channel DDR4-2667 MHz memory.