At German forums, a user has discovered ASUS X470 manuals, including specification summaries for the upcoming Ryzen 2000 motherboards. The boards include the PRIME X470 PRO, but many more boards are listed.

In their forums, hardwareluxx user emissary42 posts building block diagrams of several motherboards, including the TUF X470 PLUS Gaming, Prime X470-PRO, and the ASUS Strix X470-F Gaming.

The block design diagrams pretty much reveal most of the features of the upcoming motherboards, all mobos will get two M.2 slots, whereas X370 had a single M.2 mostly slot. It, however, looks like it that only the primary M2 slot run at x4 PCIe lanes. Ryzen has four lanes dedicated in the processor for one M2 unit, any other would be linked through the chipset at x2 lanes. The designs also show a standard ATX form factor with four DDR4 compatible DIMM slots.

The specification sheets specifically show a difference in 2nd Generation Ryzen and 1st Generation Ryzen, when looking at DDR4 memory support, Zen+ seem to bring support for faster memory, the ASUS feature sheet shows Ryzen 2000 (Pinnacle Ridge CPUs) to support memory up to 3466 MHz. So, there is some gain to be found there as well. Overall, exciting times alright, we can't wait what AMD brings to the table next month. 

ASUS X470 Motherboard manual leaks, and reveals a lot of info