According to a press release dated 3 July 2018, the new 500-forint notes will enter circulation on 1 February 2019, although they were declared legal tender from 4 July 2018. Like B581, but new color scheme and improved security features. Courtesy of Thomas Augustsson, Claudio Marana, and Ilkka Malmi.
According to a press release, the Magyar Nemzeti Bank unveiled a new 1,000-forint note with enhanced security features to be introduced 1 March 2018. The existing notes of the same denomination will be withdrawn starting 1 November 2018, and will be demonetized 1 November 2038. Courtesy of Ilkka Malmi,