At Computex in a press-conference AMD just announced Ryzen Threadripper Gen2, much like Ryzen 2000 based on 12nm Zen+ architecture. Marketed as heavy metal Threadripper.
AMD will be launching several new models including a staggering 32-core and 64-threads processor. The new 32-core processor fits into the current SP3 socket with your existing X399 motherboard, likely accompanied by a firmware update. It has four eight-core dies under that heat spreader, these would be the new 12 nm 8-core "Pinnacle Ridge" dies that bring the advantages of Precision Boost II and XFR 2.0. AMD had working samples at the Computex event, crunching away in Blender with a live demo.
Though names have not been mentioned, we expect Ryzen Threadripper 2900X, 2920X and 2950X and personally, I like the sound of Ryzen Threadripper 2990X. As mentioned, with Threadripper Gen2 you can expect a refresh of the current line-up; an 8-core Threadripper 2900X, a 12-core Threadripper 2920X, a 16-core Threadripper 2950X and the new 32-core /64-threads SKUs. Since the gap from 16 to 32 cores is a big one, perhaps we'll see a 24 core version as well. AMD will apply the same Zen+ tweaks to the processors; including memory latency optimizations and higher clock speeds. A release and availability date has not been mentioned though AMD stated that the lineup is in the works, and you can expect a Q3-2018 launch for the initial SKUs.