The existence of the Samsung Galaxy A20s has been confirmed, as a device by this name has just gained Bluetooth SIG certification. In addition, a new model number that may conform to the rumored A71 has appeared on Geekbench. This listing hints at a 2020 release for this phone, as it is described as running Android 10.
https://www.notebookcheck.net/2-Galaxy-A-series-phones-of-the-future-pop-up-in-new-leaks.433591.0.html