How do you know definitively what the story is?
How do
you know? As far as I'm concerned, everything up to this point is speculation based on what we've got, and even that might not hold ground if they changed some of the story concepts from then to now.
There's actual indication of what the story is gonna be from the Shakespearean quotes from Hamlet and the whole family set up from the characters on both sides.
There is no "both sides". This isn't about two rival families. This is Niflheim versus the nations with crystals. There might be more families(kingdoms) involved, each with their own motives to be played. What I see when I see the word "Shakespearean" thrown around is not spamming literal concepts from Hamlet or Romeo & Juliet, but taking the concepts behind tragic drama and the intrigue that comes with bonds and betrayal.
Heck. Baz Luhrmann is Tetsuya Nomura's biggest influence and he said so himself. You know what one of his famous movies is? Romeo + Juliet from 1996. If you know about his movies you know how FFXV screams Gatsby's art style and extravagance and R + J's characters.
We know how big of a movie nut Nomura is, and it wouldn't surprise me of the Shakespearean influences (accented by his love for Luhrmann's work and R + J) drive the plot for this game.
Nomura being a Baz Luhrmann fan means nothing. XV looks no different than what I'd expect out of any other FF game, art style and feel. That, and the fact that, well, Nomura's not directing anymore. Also take into consideration what I said above. We don't know what changed from the course when they first used the Hamlet quote up until now. Remember this well, Nomura said Stella was not meant to have a traditional romantic relationship with Noctis, and that they would be more "close friends" than lovers. Also know he said this EARLY into development. If that concept carried on, that would quash the "star-crossed lover" notion people have made up for themselves. If the idea was changed, we don't know what else could've been changed either. Besides, LOL, immediately people think Baz when they mention "Shakespeare", even though he only made ONE Shakespeare movie. LOL indeed! EVEN if Nomura meant to add a homage to R+J in Luna's hair(or something else), I doubt he'd be so stupid to make XV by ripping off either of them.
C'mon guys, give Nomura a little more credit than that. I'm sure Nomura's going to give us something solid that feels "familiar" in ways many other FF games do, but also does it's own thing. It's not going to be Hamlet + Romeo & Juliet. That would be creatively bankrupt.
I do think people are grasping for straws, and in a way, I don't blame you guys. We've been starved of plot details so our minds go crazy with drawing connections that might not be there at all. In the end, all those quotes you've posted are nothing more than speculations based on opinions, that's all. Nothing more and nothing less.
And the quote from Hamlet was just that, a quote. It was meant to reflect the theme of the world. There's not going to be a clear hero or villain, and motivation will be muddied into a grey area. Villains will likely be believable and we'll understand why they are doing the things they do, and there might be situations where we(the heroes) have to make decisions that aren't considered "morally good". That is likely the weight of that quote when applied to FFXV.