Entries pertaining to the AMD Ryzen 5 3400G and Ryzen 3 3200G have been spotted in the SiSoftware benchmark database. The new 'Picasso' Zen+ APUs are similar to their previous generation counterparts in most aspects save for slightly increased base and boost clocks. Also seen in the database is a reference to the B550 chipset that will supposedly succeed the current mid-range B450.
https://www.notebookcheck.net/AMD-Ryzen-5-3400G-and-Ryzen-3-3200G-spotted-in-SiSoftware-database-along-with-the-B550-chipset.421145.0.html