The original sign was not unique and in many ways reflected that of the original publications in the UK, whereas the logo used on the movies was closer to that of the original US version, and the new logo was presented on Broadway first in a full Time Square takeover and on Back To Hogwarts Day.
The change has had a lot of fans angry about this claiming that the story is seperated from the Harry Potter cannon and this marks that seperation, but why would there be this change?
The obvious conclusion is that there is a movie version on the way, Warner Bros. owns the movie rights to the series and have been a partner to Harry Potter Theatre which produces the stage show.
The rumours have been denied by everyone including J.K. Rowling who posted some cryptic tweets, but are they just not telling the absolute truth because it's not time to announce it yet?
For Warner Brox. who have made Billions of dollars from the series want that money to keep rolling in, The Fantastic Beasts series had a promising start but last year Fantastic Beasts: The Crimes Of Grindelwald didn't do as well as they would have liked.
The theme park area at Universal Studios are doing well, and are keeping the franchise alive, but there needs to be a new movie for Warner Bros. that fans can sink their teeth into.
Rowling could write a whole new set of Harry Potter centric stories especially for the screen, but she will need to please the fans, and she has always stated after the books she wont revisit Harry Potter and his world again.
She keeps tight control over everything Harry Potter, but she could commission a new writer/screenplay write to come up with some new stories, The Cursed Child was written by Jack Thorne and John Tiffany with Rowling only providing the story, so this is ground she has been down before.
As much as this is something which may be explored in the future, why bother when you have a tried and tested story already there and waiting for a screen version to be produced, its Harry Potter, its already written and it would most likely take over a Billion dollars at the box office.
Also it would bring the story to the fans who either dont go to the theatre, it is a niche past time which although having the boy who lived as brought more more bums on seats to theatre in the same way the books got people reading again you are still making inaccessible to some.
I am going to stick my neck out and say there will be a movie version of Harry Potter And The Cursed Child in the long run, there is just too much of a money making opportunity there for Warner Bros., and as the film is already in 2 parts I am sure it can be dragged out to a trilogy, a 3 Billion plus grossing trilogy.