According to a press release dated 24 September 2013, Narodowy Bank Polski has unveiled the new 10-, 20-, 50-, and 100-złotych notes to be issued in April 2014 (for the time being, there are no plans to change the 200-złotych note). The overall designs remain similar to the existing notes of the same denominations, but the security features have been improved.
Courtesy of Krzysztof Czupryński.