Looks like it could have a pseudo-documentary style, where there's running narration throughout coming from an interview or something set at the end of the movie's events.
Because of this trailer, my anticipation just grew bigger. Looks really cool.
As for the wannabe celeb kind of thing, I think this movie will portray it just perfectly (you can already tell it from Emma's voice lol). I've never researched the real story of this "gang", but the characters already look totally bitchy and ruined by all this "I wanna be a star" thing.
I'm really digging the bitchy, star-wannabe group, despite me despising those kinds of people. I'm in two minds over whether that last line was supposed to be a serious delivery or not, but it has definitely left me more interested.