Some rumors and whispers have been making the rounds lately, regarding a HEDT platform incoming from AMD. This platform (built upon a new X399 chipset planned exclusively for it) would use a cut-down version of the Naples-based server SP3 socket called SP3r2. SP3r2 and the new chip will reportedly offer quad channel memory support, pitting them directly in competition with Intel's HEDT lineup in terms of memory bandwidth.
Reportedly, engineering samples of the 180W 16-core Ryzen currently run at 3.1 GHz Base, 3.6 GHz Boost clocks, which leads towards performance in the level of two Ryzen 7 1700 chips. If the rumors are true and such a platform is in development, then we will surely hear of some more chips designed for it. Going through the trouble of creating a new chipset and platform for a single CPU model doesn't seem likely. Perhaps some 12-core and 20-core chips are lurking just below the surface?