According to a press release dated 5 July 2018, the National Bank of Poland plans to introduce a revised 50-złoty note on 16 July 2018. This is merely a signature and date variety of B861, not a new type.
Courtesy of Jan Boguś.
2018-07-08
Poland new sig/date 50-złoty note (B861b) reported for introduction on 16.07.2018
Previous Post: Jordan new sig/date (2018) 5-dinar note (B230g) confirmed