Los Angeles Times: Shoot first, fill it in later

"In fact, it's just the sound stage for "World of Tomorrow," a period action-adventure with science-fiction elements starring Jude Law, Gwyneth Paltrow and Angelina Jolie and being filmed at these studios 15 miles northwest of London. Why blue? Because it is being shot entirely on (you guessed it) blue screen, which means backgrounds behind the actors are filled in digitally after principal photography."

Sure, I thought to myself, another gimmicky movie. But then I read this quote...
"Blue screen is tricky and unusual, but I've found the process freeing, almost theatrical in a way," Law said. "It's like working in an empty space. I've played in several theaters with basic props and an empty stage. Here we have half an airplane, and only suggestions of sets. But you have so much information about what it looks like beforehand, which is so valuable."

... and I think "Hey, this could be good!"