Leaked by the Korean Bodnara.co.kr site, the motherboard in question is Gigabyte's B350M-DS3H which is based on AMD's mainstream B350 chipset. The set of features is pretty much standard for a mainstream motherboard and although we expect some motherboard to pack a few more high-end features, this is pretty much what will be getting while the real high-end comes with AMD's X370 chipset, scheduled to come early next year, with Zen-based Summit Ridge CPUs.
The motherboard includes the new AM4 socket with 1331 pins, four DDR4 DIMM slots and draws power from a combination of 24-pin ATX and 8-pin EPS power connectors. The rest of the features include two PCI-Express 3.0 x16 slots (x8/x8 or x16/x4), single PCI-Express x1 slot, six SATA 6Gbps ports and NVMe PCIe M.2 slot, a couple of USB 3.0 and USB 3.1 ports and integrated Realtek audio.
The set of leaked pictures also briefly shows the Gigabyte UEFI BIOS with DDR4 settings and 1.2V voltage.
We are quite sure that we will see plenty of these motherboards soon as we draw closer to the rumored October launch for Excavator-based Bristol Ridge APU launch.