Warner Brothers with Legendary Films made official just now what everybody in Hollywood already knew: its upcoming slate will be filled with 3D titles. Its feature film Clash of the Titans will be released in 3D worldwide and simultaneously in 2D on Easter Weekend April 2nd. (Which prompted several studios to hastily move release dates so as not to compete.) Doing the visual effects work will be Prime Focus, which received an Oscar nod today for Avatar.

Additional titles in 2010 that will be released in 3D (in addition to 2D) include Cats & Dogs: The Revenge of Kitty Galore (July), Guardians of Ga’Hoole (September), and Harry Potter and Deathly Hallows, Part 1 (November) — and I’m told Part II as well at a later date

Said Dan Fellman, President, Domestic Distribution, Warner Bros Pictures, in the announcement, “We are experienced and have been successful in the conversion of 2D to 3D going back to such hits as The Polar Express, select scenes in Superman Returns and the last two Harry Potter films.” Fellman continued, “The results for Clash of the Titans will be presented onscreen with the highest-quality images available today.”

Jeff Robinov, President, Warner Bros Picture Group, said, “We’re excited about 3D and look forward to bringing a rich, involving visual experience to audiences around the world.”