That seems pretty clear to me that there's AM4 Ryzen and also there will be an AM4 A-series and an AM4 Athlon line. AMD has said repeatedly that AM4 is going to be the one socket for all their new chips from the server through to mobile. Look for the Opteron (or its replacement if the new server chips get a name change), the A series, the Athlon series, and Ryzen all to use the same socket but offer different memory and PCI configurations based on both the chipset and the CPU/APU.
4 x DIMM, Max. 64GB, DDR4 2666/2400/2133 MHz ECC and non-ECC, Non-ECC, Un-buffered Memory
AMD 7th Generation A-series/Athlon™ Processors
4 x DIMM, Max. 64GB, DDR4 2400/2133 MHz Non-ECC, Un-buffered Memory
That seems pretty clear to me that there's AM4 Ryzen and also there will be an AM4 A-series and an AM4 Athlon line. AMD has said repeatedly that AM4 is going to be the one socket for all their new chips from the server through to mobile. Look for the Opteron (or its replacement if the new server chips get a name change), the A series, the Athlon series, and Ryzen all to use the same socket but offer different memory and PCI configurations based on both the chipset and the CPU/APU.