More X470 photos hit the web. VideoCardz uploaded photos of the Biostar X470 Racing GT8 (pictured below) and Biostar X470 Racing GTN motherboards.
The former is the flagship model, it has three PCI Express x16 slots, one PCI Express x1 slot, one M.2 slot, and Realtek ALC1220 audio. The I/O panel offer a full-sized DVI-D port.
Then there's the Biostar X470 Racing GTN, a Mini-ITX variant with a single PCI Express x16 slot. It has ALC892 integrated audio and a M.2 slot on the back. This one also has DVI-D (and no WiFi adapter).