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Harry Potter and the Cursed Child is a play written by John Tiffany and Jack Thorne with the blessing and support of J.K. Rowling (July 2016).
In the play, Harry and Ginny’s son Albus goes to Hogwarts and befriends Scorpius Malfoy, Draco’s son. Albus and Scorpius steal a Time-Turner and alter time. They are encouraged in this by a mysterious young woman named Delphi who turns out to be masterminding the rise of Dark Magic once again.
The play is made up of two separate performances, either one as a matinee and the other in the evening or on two consecutive days.
Cursed Child
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From the Web
Harry Potter and the Cursed Child: Rewriting Stereotypes by Ilaria Villa
Pottermore: Harry Potter and the Cursed Child
The theatre production opened in the West End of London at the Palace Theatre on 30 July 2016: Harry Potter and the Cursed Child, Parts One and Two
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Ever since its release, fans have debated the canonicity of the play's script. While Rowling herself refers to this as canon and as the "eighth story," the fact that it was not actually written by Rowling and that some aspects of the story seem to contradict primary canon leave many fans hesitant.
To be clear, Rowling does describe the story as being canon. She doesn't go so far as to say that every detail is canon. This leaves plenty of room for debate among fans, since in that way it is similar to the films.
https://twitter.com/jk_rowling/status/615498601809211393