According to these leaks, the upcoming HEDT platform from AMD will feature quad-channel DDR4 and more PCIe lanes than what's offered by the current Ryzen platform. It's meant to compete with the Intel HEDT lineup and will use a different socket than the regular Ryzen CPUs.
Now there's a new leak that suggests there's also a 12-core version with 24-threads. VideoCardz spotted a SiSoft Sandra benchmark listing that shows an AMD engineering sample that's identified as the 2D2701A9UC9F4_32/27_N (2N 6M 24T 2.7GHz, 12x 512kB L2, 8x 8MB L3).
The chip is a second-generation B-stepping engineering sample, it has a base frequency of 2.7GHz, a 3.2GHz Turbo, 12x 512KB L2 cache and 8x 8MB L3 cache. Also worth mentioning is the benchmark listing reveals the chip is housed in the Alienware Area-51 R3 gaming PC.