We reported about it earlier, now it is official. Apple officially announces the availability of new movies on iTunes on the same day the DVD release is taking place.

New movie releases and catalog titles will be available from 20th Century Fox, The Walt Disney Studios, Warner Bros., Paramount Pictures, Universal Studios Home Entertainment, Sony Pictures Entertainment, Lionsgate, Image Entertainment and First Look Studios.
Movies purchased from iTunes can be viewed on an iPod with video, iPhone, Mac or PC or on a widescreen TV with Apple TV, with new releases priced at $14.99 and most catalog titles at $9.99.
"We're thrilled to bring iTunes Store customers new films for purchase day-and-date with the DVD release," said Eddy Cue, Apple's vice president of iTunes. "We think movie fans will love being able to buy their favorites from major and independent studios."

New releases available for purchase on the iTunes Store this week, concurrent with their DVD release, include "American Gangster" and "The Diving Bell and the Butterfly." Other popular titles now available for purchase include "Juno," "Cloverfield," "I Am Legend," "There Will Be Blood," "Alvin and the Chipmunks" and "Walk Hard: The Dewey Cox Story."

In the case of American Gangster, Amazon.com also just charges $14.99 for the DVD. The convenience of downloading a movie, when you want is very exciting especially with an Apple TV, so you can watch it right now on a big screen TV.
More details on iTunes.