Think of it this way... We only have some months till the game releases next year, and since it was in development for 10 years, they're probably nearly done with the game and putting on final touches. What I mean by that is they want Destiny to be completely surprising to EVERYBODY. There won't be walkthroughs coming out by youtubers who got the game early, or everyone, knowing the storyline, characters, before they get bored by the game expecting everything. Bungie has approached this game in a very interesting way, and the less you get spoiled, the better this game is gonna be.