https://jaysbrickblog.com/news/lego-registers-brick-to-the-future-trademark-more-back-to-the-future-sets-coming/
Seems like the popularity of the Delorean set has confirmed to the LEGO bigwigs that it's a theme worth expanding.
Could just mean a new kid's LEGO show "Brick to the Future" seems more in line w/ a story line.
That said, new sets have a way from originating from LEGO show scene. I would LOVE a set of the Steam engine (from BttF Part 3) that converts to a futuristic flying train, or a proper modular of the clock building that gets hit by lightening