Presumably, these new processors are the Raven Ridge based APUs. These feature Zen-based processor cores and Vega based integrated graphics. The first laptops with Ryzen Mobile APUs are already available so an upcoming launch of the desktop counterparts makes sense.
However, Asus stating that the update is for new upcoming processors indicates that AMD will be expanding its AM4 processor family in some way. Asus currently seems to be the only AMD motherboard partner offering the new BIOS (dated 11-17-17), and it seems the company has let a significant cat out of the bag.Via: Tom's Hardware