If this is promoting new Back To The Future content, I think a video game makes much more sense than a movie, since the actors are getting old but their voices can still adapt.
For those unaware, this has been done once already via TellTale's Back To The Future: The Game (http://www.telltalegames.com/backtothefuture/) which offers interesting story and featured many of the original actors' voices and takes place a few months after the original movies. (If you don't want to buy it, you can also watch a playthrough on YouTube.)
For those unaware, this has been done once already via TellTale's Back To The Future: The Game (http://www.telltalegames.com/backtothefuture/) which offers interesting story and featured many of the original actors' voices and takes place a few months after the original movies. (If you don't want to buy it, you can also watch a playthrough on YouTube.)