As far as I've been able to tell so far, Final Fantasy XV will be about four bros driving around in a sweet car and broing it up on a road-trip occasionally punctuated by fights.
This new trailer from the weekend's Jump Festa event in Japan actually confirms that, yes, this is the plot of Final Fantasy XV. But it gives some background for why they're on the roadtrip in the first place, which is a looming war.
We also get a look at this game's version of Cid, the recurring character that's popped up in different forms in almost every Final Fantasy game. This version of Cid, short for Cidney, is a mechanic like Cid in Final Fantasy VII, but not quite so grizzled. She also wears much skimpier clothes.
The trailer shows off a nice mix of the outrageously fantastic and the mundane and modern. We're looking forward to seeing how it all fits together when the game eventually comes out.