'Star Wars: The Last Jedi' Will Indeed be Leia's Final Appearance
Just recently, the family of the late Carrie Fisher made a public announcement that they'd given permission for Lucasfilm and Disney to use pre-taped footage of Fisher as Leia in Star Wars: Episode IX. It was seen as the closest answer we'd gotten to the looming "How will they end Leia's story?" question.
Turns out, Todd Fisher was overstating things a little. Permission or otherwise, Lucasfilm head Kathleen Kennedy has denied that Leia will appear in IX, firmly stating that Episode VIII, The Last Jedi, will be Leia Organa's final appearance. In an interview with ABC News, she described Todd Fisher as "confused" when she heard what he said.
"Sadly, Carrie will not be in nine," said Kennedy. "But we will see a lot of Carrie in eight." It's probably for the better, as Fisher likely gave a stronger final scene in The Last Jedi than anything which had pre-taped for some future use. But with Lucasfilm trying to avoid doing anything tasteless with Fisher's iconic character, ending her story in The Last Jedi makes the most sense.
Carrie Fisher's family is a fairly credible source, but "giving permission" isn't the same as "confirmed to appear." So if the head of Lucasfilm says otherwise, then she likely won't be appearing. Unless more news comes out, then we'll update everything then.