According to ComingSoon.net:
Paramount Pictures and Sony Pictures Entertainment have announced the start of principal production in Los Angeles on the 3D Motion Capture Film The Adventures of Tintin: Secret of the Unicorn directed by Steven Spielberg and starring Jamie Bell (Billy Elliott, Defiance) as Tintin, the intrepid young reporter whose relentless pursuit of a good story thrusts him into a world of high adventure, and Daniel Craig (Quantum of Solace, Defiance) as the nefarious Red Rackham.
Bell and Craig are joined by an international cast that includes Andy Serkis, Simon Pegg, Nick Frost, Gad Elmaleh, Toby Jones and Mackenzie Crook.
The Adventures of Tintin: Secret of the Unicorn from a screenplay by Steven Moffat, Edgar Wright and Joe Cornish, is produced by Spielberg, Peter Jackson and Kathleen Kennedy, is the first in the series of 3D motion capture films based on the iconic character created by Georges Remi, better known to the world by his pen name "Herge" and is due for release in 2011. Executive producers are Nick Rodwell, Stephane Sperry and Ken Kamins. Paramount Pictures will release domestically and in all English speaking territories and Asia, excluding India. Sony Pictures Releasing International will distribute the film in Continental Europe, Eastern Europe, Latin America, India and the remainder of the world.
The second feature in the series is scheduled to be directed by Jackson, with a potential for a third film as well.
Eighty years ago, Herge introduced the world to a unique cast of characters who have been embraced by readers of all ages. The Adventures of Tintin - a series of 24 books, the final unfinished adventure was published after Herge's - death became Herge's life's work. The first adventure was published in 1929. Over 200 million copies have been sold worldwide. The popular series has been translated into 70 languages and still attracts thousands of new fans each year.
Steven Spielberg and Peter Jackson will bring Herge's stories to life employing state-of-the-art performance capture technology developed by Jackson's Weta Digital."
I've done some other research and found that each film can be shot in 30 days. Then, why isn't it coming out sooner? Never thought I'd see the day when Spielberg would direct a movie with the word "Unicorn" in it... by the way, "Unicorn" in the story, is the name of a boat.