During Rey's time on Ahch-To in The Last Jedi, Luke Skywalker promised to give her three lessons about the Force. However, audiences only saw two of Luke's lessons. While it's possible that Luke will give Rey additional guidance in Episode IX, director Rian Johnson has confirmed that a significant sequence between Rey and Luke was cut from the final film, and may end up on the Blu-ray among The Last Jedi deleted scenes.
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While speaking with Collider, Johnson described a deleted sequence that involved an "additional sort of trial/test that [Rey] goes through," as well as a "big emotional scene between” Daisy Ridley and Mark Hamill.
Johnson has been vocal about his belief that the finished film is his director's cut, so none of these scenes will be added back into the narrative. Johnson's initial cut for The Last Jedi was said to be close to three hours long, but he noted that the extended and deleted scenes on the Blu-ray and DVD will run around 20 minutes.
Additionally, Johnson alluded to a much longer version of Finn and Rose's mission on the Mega Destroyer, including a sequence in which they "fake out these Stormtroopers." He added that Finn and Poe have more scenes together where Poe tells his friend everything that happened to the Resistance since The Force Awakens.
Lucasfilm hasn't yet set a date for Star Wars: The Last Jedi on home video, but an April or May 2018 release seems likely.