While we wait for an official "Extended Edition" stamp, the best way to experience more of Cuarón's vision remains the Deleted Scenes
The "Ultimate" Cut: Is a New Extended Version of Prisoner of Azkaban Finally Coming? For nearly two decades, Harry Potter and the Prisoner of Azkaban While we wait for an official "Extended Edition"
"I know some scenes have been fitted in – ABC, who showed some of the films in the US, had extended cuts which included some of the deleted scenes. I never like those... There's a reason why we delivered those [theatrical cuts]." While we wait for an official "Extended Edition"