When I first saw the headline, I thought "this is amazing...Darren Aronofsky's directing a movie based on the book by Nassim Taleb and Natalie Portman's gonna star in it!" The plot of the actual movie is only slightly less implausible:
"Swan" centers on a veteran ballerina (Portman) who finds herself locked in a competitive situation with a rival dancer, with the stakes and twists increasing as the dancers approach a big performance. But it's unclear whether the rival is a supernatural apparition or if the protagonist is simply having delusions.
Hey, they're making Blink and Moneyball into movies, why not The Black Swan?
Update: An additional important note about this film:
In this movie, Natalie Portman and Mila Kunis have sex. Yeah. You read that right. And not just nice sweet innocent sex either. We're talking ecstasy-induced hungry aggressive angry sex.