Disney have confirmed that its the official draft script..they say the story will be exactly the same..but the dialogue will be alot better and polished..
In my opinion the reason why that was leaked to a competition winner was because there are already hints in movie 2 that basically tell us what is going to happen at the beginning of movie 3...its funny how it stops..right where the hints stop in movie 2 😂
Also what happens with the key mimics it too..That key...I think it actually shows us what is going to happen at the end of the trilogy too..Its basically how Liz is feeling towards each man as it passes through all their hands..
Little example:
Will has it - loses it because he is more concerned with his father
Will loses it to norington - the moment where norrington did the "right thing"
Norrington loses it to Jack - He comes back for her on the pearl
Jack puts it proudly around his neck, struts and falls right into a grave - Liz is afraid at the boldness of Jack so she removes the temptation
Jack still has it on in the grave - he still has Liz whilst he's in his purgatry
Big wheel comes along - Jack gets pulled out of purgatory..
he has it on for a while..but it slips away - foolishly hands Liz over to Sao Feng
He thinks its safe on a hook..smiles thinking he is going to get it back but WHAM - Jack thinks she is safe..thinks he's being clever but WHAM Liz is in danger
Jack is STILL after that key trying to capture it whist Will is busy fighting - Jack will probably be the one who saves her when she needs it again
Jack actually saves it from WILL who has it on the end of his sword - Will is going to threaten Liz?
and it goes on...and on..