You'll be able to control and play as your other party members after the December update. Here's a video showcasing the feature:
Full article: http://www.siliconera.com/2017/11/29/final-fantasy-xv-add-character-swap-function-december-update/
Square Enix also revealed that there will be at least three more story expansions coming in 2018. Starting with Episode: Ardyn.
"The first has been confirmed for Ardyn. There was many who pointed out that story for the world is lacking, but Square Enix will make sure to tell us more about Eos in the episode for Ardyn."
Full article: http://www.siliconera.com/2017/11/29/final-fantasy-xv-getting-least-three-dlc-episodes-2018-starting-episode-ardyn/
Being able to fully control your car, being able to play as your other team members. I'm glad I waited before playing this game. Sounds like it'll be a much better product by the time I start playing it.