ASUS hasn't yet announced the purported ROG STRIX B350-I-Gaming motherboard, but Swedish online retailer Inet has, with plenty of details and photos to look at.
The new ROG STRIX B350-I-Gaming motherboard uses the B350 chipset, with support for up to 32GB of DDR4-3200 RAM, and any Ryzen 3/5/7 processor. ASUS will be including a single PCIe 3.0 x16 port with 2 x USB 3.1 Gen 2 ports, and 4 x USB 3.1 Gen 1 ports.
Storage wise, we have 2 x M.2 slots and 4 x SATA 6Gbps ports, and considering this is a mini-ATX there is an awesome amount of storage capabilities provided by ASUS. There's also GbE and built-in Wi-Fi as well as SupremeFX 8-channel High Definition Audio on-board.
We should expect a price of around $229-$249 for the ASUS ROG STRIX B350-I-Gaming motherboard, not bad if you mix in a perfectly-priced Ryzen 5 1600X for a crazy-fast mini-ITX gaming PC powered by AMD.