Also is that theme for premium owners only or anyone who has the season pass?
I don't know, but it wouldn't surprise me if it was not in the season pass.
A lot is not in the season pass. Even premium, deluxe and ultra editions of the game are missing half the stuff. There is no edition, as expensive as it may be, where you actually get everything.
Regarding the story I want to rant a little, since I noticed I actually didn't even write up a little review of what I thought about the game:
FFXV has imo a quite simple but compelling story, the characters are interesting and likable and the villain is one of the best of the FF series. Sounds awesome, right?
Well, the problem is, that story isn't actually told in the game. They leave like 50% completely out for you to read up in the game guide, or watch it in Kingsglaive or the Brotherhood anime and a couple of other sources.
FFXIII was a convoluted mess storywise but at least that mess was beautifully told in many pretty cutscenes and stuff that didn't make it in there, made it into the game's archives, where walls and walls of text about FFXIII's ridiculous world and lore was available for you to read. If you had the nerve...
There is nothing of that sort in FFXV though, even though you could easily tell it's story and lore on one single sheet of paper. :/