Okay, so I'm not seeing any other threads mentioning this, but I gotta throw in my speculation. Doc pretty much drops a big bombshell when he mentions he and his family are gonna visit Marty and Jennifer in 2011. This raises a number of questions;
1. Are we gonna see Doc's family? I wasn't much of a fan of the cartoon, but I'd still like to see them, being a somewhat bizarre time-traveling anomaly. Hell, Jules and Verne shouldn't even exist by any normal circumstances. It'd add some extra dimension to the story IMO.
2. Are we gonna see 2011? All I know is back to the future MUST have a future episode. What's the point of time traveling if all you do is go backwards in time?
3. Is this 2011 gonna be like our present, or similar to the movie's 2015? Because I'm certain by the time 2015 comes around, all the fans are gonna point out how completely off the movie's prediction will be. Unless we somehow get hoverboards and flying cars in the next four years. It'd be fun to see Marty's surprise out how different the future turned out. Going to the same future would be too predictable.
4. Now that I think about it, where is Doc's family? You'd think they'd come looking for Doc. I mean, they got their own time machine in the form of a flying train!