HP have announced an Athlon or Ryzen-based model to complement their Intel-based HP Pro C640 which released earlier in August. The new AMD Athlon C and Ryzen C options combine with up to 16 GB RAM and a 128 GB NVMe drive to create an impressive Chromebook.
https://www.notebookcheck.net/The-HP-Pro-C645-Chromebook-boosts-AMD-in-the-enterprise-with-new-Athlon-C-and-Ryzen-C-processors.494960.0.html