There is a lot to take in here. The most interesting points are that Intel plans to one-up AMD Threadripper by offering an 18-core processor but it also wants to change the perception of the X299-class platform by offering lower price, lower core count CPUs like the quad-core, non-HyperThreaded Core i5-7640X. We also see the first ever branding of Core i9.
Intel only provided detailed specifications up to the Core i9-7900X, a 10-core / 20-thread processor with a base clock of 3.3 GHz and a Turbo peak of 4.5 GHz using the new Turbo Boost Max Technology 3.0. It sports 13.75MB of cache thanks to an updated cache configuration, includes 44 lanes of PCIe 3.0, an increase of 4 lanes over Broadwell-E, quad-channel DDR4 memory up to 2666 MHz and a 140 watt TDP.
The new LGA2066 socket will be utilized. Pricing for this CPU is set at $999, which is interesting for a couple of reasons. First, it is $700 less than the starting MSRP of the 10c/20t Core i7-6950X from one year ago; obviously a big plus. However, there is quite a ways UP the stack, with the 18c/36t Core i9-7980XE coming in at a cool $1999.