As we posted when the Harry Potter and the Cursed Child script book was first announced, there will be a “Definitive Edition” released later this year. This second edition, Harry Potter and the Cursed Child, Parts One and Two: The Official Playscript of the Original West End Production, will be published July 25, 2017.  According to Amazon:

This revised paperback edition updates the “special rehearsal edition” with the conclusive and final dialogue from the play, which has subtly changed since its rehearsals, as well as a conversation piece between director John Tiffany and writer Jack Thorne, who share stories and insights about reading playscripts. This edition also includes useful background information including the Potter family tree and a timeline of events from the wizarding world prior to the beginning of Harry Potter and the Cursed Child.

Additionally, the Cursed Child site announced that another wave of tickets will be released on April 25th. Three months of advance tickets will be released for sale on Tuesday 25 April 2017, at 11am BST, for performances from 2 May 2018 –  22 July 2018. Tickets are priced from £15 per part and for every performance there will be over 300 tickets at £20 or less per part.