Here are some of my thoughts on a 4th and final one maybe. Not sure how well others will look on it.

- Jules and Verne become slightly twisted due to whatever they mightve experienced and use what they learned from their father Emmit, and try to change the timeline how they think things should be.

- The year 2015 isnt as it shouldve been when Marty first visited that future. Jules and Verne mustve done something in the past to alter the timeline.

- Emmit "Doc" Brown is slightly older, wears a long white futuristic scientist coat, hes bald, and has a lincoln style beard.

- The Doc used the DeLorean as a template to make something similar but different. Its black with sleeker looking exhausts in the back. It also has a formula/equation input panel interface on the passenger side so adjustments can be made to how the temporal device installed in the new DeLorean interacts with time. There would also be other various upgrades and enhancements over its predicessor.

- Clara is preserved by Jules and Verne in such a way she is outside of the timeline and untouched by the changes they had brought about.

- As the Doc and Marty are being chased in the DeLorean, the Doc puts in various equations and formulas in the panel, he had stopped the reaction that occurs at 88mph, and they are continuing to accelerate, generating an unusuall temporal field around them. Several moments later, the temporal field around them fluxuates, and a weird flash occurs, and they split in two different directions. The Doc had put in an experimental paradoxical equation allowing two of them to exist. Where one DeLorean went one way, another went the opposite. He figured they would need help in order to stop his...their sons. And restore the timeline.

- Their is also a bit more action in this one, Doc will fight, Marty will fight, and others.

- The whole movie looks and feels a little bit Cyberpunk. A lot of tech designs would be seen, and very futuristic in a dark and sleek kind of way since Jules and Verne adjusted the timeline.

The three songs that helped me think of these details, and others I didnt mention yet are these...

"Plasmatic" by Zeromancer

"Houses of Cards" by Zeromancer

"Split Seconds" by Zeromancer

Hope my thoughts are at least somewhat interesting.