Saw this over at Tom's Hardware. If the new 3900 at 65 Watt is anything like 3700X and 3800X, I will pick up the new 3900 for a SFF build over 3700X.
https://www.tomshardware.com/news/ryzen-9-3900-ryzen-7-3700-ryzen-5-3500-amd-3000-series,40040.html
https://www.tomshardware.com/news/ryzen-9-3900-ryzen-7-3700-ryzen-5-3500-amd-3000-series,40040.html