Today in show business news: A new movie trailer has Saoirse Ronan running around the woods with a gun, Vin Diesel might be playing a tree, and Brad Pitt has a new record.

At a mere 19 years old, Saoirse Ronan is becoming a real movie star. Not just that, but she's building a little action career for herself too. She played a highly trained killer kid in Joe Wright's wild kaleidoscope Hanna, and now we have a trailer for the deceptively titled How I Live Now. That sounds pretty generic, and the beginning of the trailer lives up to that vagueness: It's all about a sad girl moving away and falling in love with a boy and it all seems pretty dreamy and bland. But then! The world sort of ends? Or some sort of catastrophe happens, something nuclear, and everyone is rounded up and taken to camps until Saoirse and a little girl escape and become survivalists of a sort in the woods. She wields guns and all that. People are comparing this to Hunger Games, because she's a teenage girl being violent in the woods, and I see that, but hm. It seems different. And it looks good! As young actors go, Saoirse Ronan is pretty likable. Better she flourish than, say, Chloe Grace Moretz. Don't you think? I think you do. So, we should all go see this when it comes out.

Vin Diesel might soon be playing a tree. Well, OK, a "tree-like alien." Named Groot. This is for Marvel's next big thing, Guardians of the Galaxy, the movie version of a somewhat lesser-known franchise in their library. And Vin Diesel is in talks to play Groot the tree thing. How about that. If he does get cast, he'll join Dave Bautista as Drax the Destroyer, Djimon Hounsou as Korath the Pursuer, Michael Rooker as Yondu, and of course Chris Pratt as Star-Lord. Y'know. Just good old Groot, Drax, Korath, Yondu, and Star-Lord, palling around space. Guys, I think this movie is going to be a hard sell. Don't you? The more we learn about it, the more it seems like... not a sure thing. In any way. But, then again, Thor seemed destined to tank and part two comes out this fall. Though, his name is Thor. Not Star-Lord. Or Groot. Groot, the tree. [Deadline]

Brad Pitt has reached a milestone in his career. World War Z has become his highest-grossing film ever, crossing the $500 million mark in worldwide box office. Pretty good show for almost 50, huh? Of course movie tickets cost more nowadays so it's possible that more people saw his second-biggest movie, Troy, but still. He crossed the half-billion mark and that's saying something. Especially with this movie, which had such a troubled production. Huh. It's almost as if, despite on-set problems, the movie had an interesting premise and was well-made, then got good reviews and strong word-of-mouth, and that's why people saw it. Doesn't it almost seem like that, The Lone Ranger? It almost does. [The Hollywood Reporter]

Oy. NBC has bought a "futuristic prison drama" from Green Lantern writer Greg Berlanti and Abraham Lincoln: Vampire Hunter scribe Seth Grahame-Smith. (That's not all Grahame-Smith has written, but it's definitely the worst thing!) The show, called Paradise, "is set in the late 21st century in the city of Las Vegas which is now the world’s largest maximum-security prison, known as Paradise. Matthew Turner, M.D., is its newest inmate, convicted of a murder he didn’t commit. Desperate to get back to his family and prove his innocence, Matthew will have to find a strength he never knew he had, and stay alive long enough to do the one thing no inmate has ever done: escape." OK. So. It's Prison Break in the future. Or it's this other thing called Paradise that's also set in Las Vegas in the future? Is Julianne Hough involved? Russell Brand? Anyway, this sounds both very ambitious and limited in scope. In terms of continuing it as a series, I mean. Does he just never actually break out of prison? Or does he break out early and then... It's not about a prison anymore? See, shows about characters trying to do one thing are tricky. But, whatever, I'm sure this will get greenlit and picked up and everyone will be shocked when it bombs and is canceled after three episodes anyway. It's just how things work. [Deadline]