So... I thought when the DeLorean got destroyed Doc was happy it was. I mean it was in pieces. If they were to rebuild it I don't think it would make any sense honestly. Unless some competiting scientist found Doc's notes and made his own DeLorean and you are on a mission to have it destroyed once again. That would make sense, but to have it rebuilt again after they were glad it was destroyed wouldn't make sense. What do you guys think?
"...Well Doc, it's destroyed... Just like you wanted..."
—Marty standing at the remains of the DeLorean
Marty: "Where ya going Doc? Back to the future?"
Doc: "No, already been there!"
— Doc and Marty during the final scene of Back to the Future Part lll
If anything, I bet we'll just see a picture of the DeLorean or a flashback or something.