It’s possible that she could then return to complete her training between The Last Jedi and Star Wars 9, but another possibility could be that Rey completes her training in this movie, and becomes The Last Jedi before Luke Skywalker is killed off.
Many had pointed out the reveal from The Force Awakens that Luke Skywalker is The Last Jedi, but the most interesting part of the quote from this interview is that “right now,” Luke Skywalker is The Last Jedi, which could mean Luke’s status as The Last Jedi could change, likely due to his training of Rey (Daisy Ridley), but it also leads to another potentially interesting point.
There is no question that, when Star Wars: The Last Jedi begins, Luke Skywalker is, without a doubt, 100%, the actual Last Jedi.
We’ll find out when Star Wars: The Last Jedi hits theaters on December 15.