https://wccftech.com/amd-b550-motherboards-full-roundup-ryzen-3000-ryzen-4000-cpus/

Today, AMD and its partners unveiled the first B550 chipset based motherboards which make the Ryzen CPU platform even more affordable. The AMD B550 chipset motherboards will offer similar features to the X570 chipset but at a much more affordable price point while offering support for current and upcoming Ryzen processors as confirmed by AMD themselves recently.

Compared to the B450 offerings, the AMD B550 chipset motherboards will offer support for PCIe Gen 4.0 (CPU Lanes), increased I/O in the form of USB 3.2 Gen 2/Gen 1 ports & most importantly, solid support for AMD's next-generation Zen 3 based Ryzen 4000 CPUs codenamed 'Vermeer'. It was originally planned for introduction at Computex this year but plans changed due to the COVID-19 pandemic.