According to a press release dated 18 March 2020, the National Bank of the Republic of Belarus plans to introduce new 20- and 50-ruble notes on 23 March 2020. The new notes are like the preceding issues, but dated 2020, without signatures, printed by Goznak, with additional watermark features and wider security threads.
Courtesy of I.B.and Aliaksandr Chyzheuski.