A lot of fans were disappointed that the game did not offer us the glimpse of Hill Valley's future which we thought we'd been promised with OUTATIME. Well, we did have the nice little coda in the end with the three alternate future Marty's...but frankly, I really don't think Telltale is ever really going to explore the future for any significant length of time in future installments, if any.
The reason is quiet simple...the series' philosophy, as revealed at the end of BTTF3, has been, by and large, that the 'future is not written'. This is reinforced at the end of the game, when Marty asks Doc which of the three Marty's is him and Doc says "Isn't it obvious", implying that he's the only REAL Marty, because the future is not written and the other Marty's are thus only projections of possible futures.
Now...if the future is not written, and nothing that we see of Marty, or any other character's destiny, is set in stone (because they can all be changed with the minimum of effort once Marty and Doc are back in the 1980's and live out their lives into a new future), then there really is no point in our investing much time in a plot line which we know doesn't really make a difference to the characters because its only a 'possible future'.
I mean, if you consider BTTF2...well the sole reason for showing us the future was to show us what kind of sci-fi wonderland Hill Valley's become. True, we also learn about Marty's messed up future, and his messed up kids...but ultimately, at the end of BTTF3, we learn that whatever Marty and Doc did to help Marty Jr was meaningless ultimately because the future wasn't written anyway, from their POV. In fact, I've always believed Doc's real motive in bringing Marty to help his son is so that Marty himself matures over the course of his experiances and gets over his 'chicken problem'.
Ultimately, if you look at it, the only real lasting significance the 2015 segment has to the overall plot is Old Biff stealing the Delorean and Almanac and altering the past...so once again, it is the PAST which is the focus of the series, and NOT the future.
So even if we do catch a glimpse of the future...expect it to be nothing more than a sneak peek which, at most, sets up the main plotline which is concerned with the past. After all, its only if Marty and Doc are in the past, that they can truly get "Back...to the Future"!