Warner Bros has updated their 2013 summer calendar by pencilling release dates for ‘The Hangover Part III’ and ‘300: Battle of Artemisia,’ while moving ‘Pacific Rim’ from its original May 10th, 2013 release date, to July 12th, 2013. The third installment in “The Hangover” franchise has been set a May 24th, 2013 release date, sharing the date with 20th Century Fox’s ‘Leaf Men’ and Universal Pictures’ ‘Fast & Furious 6.’ The prequel/sequel to Zach Snyder’s ’300,’ ’300: The Battle of Artemisia’ – which stars Sullivan Stapleton, Jamie Blackley, Rodrigo Santoro, and Eva Green – has been set a August 2th, 2013 release, opening opposite Columbia Pictures’ ‘Smurfs 2′ and Dean Parisot’s ‘RED 2.’

Guillermo Del Toro’s sci-fi adventure flick ’Pacific Rim’ has been moved to mid-summer, pitting it against Adam Sandler’s ‘Grown Ups 2′ (I know which film I’m going to see). ‘Pacific Rim’ is set in 2025, the 12th year of a war against giant malevolent alien creatures who reside in the middle of the Pacific Ocean. To combat its annihilation, the planet must band together and use highly advanced weapons technology to eradicate the growing threat. ‘Pacific Rim’ stars Idris Elba, Charlie Hunnam, Rinko Kikuchi, Charlie Day, Rob Kazinsky, Willem Dafoe, Ron Perlman and Max Martini. Source: Box Office Mojo. UPDATE: Warner Bros has sent over this announcement press release for ‘The Hangover Part III':

Warner Bros. Pictures and Legendary Pictures are reteaming with Todd Phillips for “The Hangover Part III,” the third installment in the record-breaking comedy franchise, which is slated for release on

May 24, 2013. The announcement was made today by Jeff Robinov, President Warner Bros. Pictures Group.

“The Hangover Part III” will star Bradley Cooper, Ed Helms and Zach Galifianakis, who will reprise the roles of Phil, Stu and Alan, collectively known to moviegoers as “the Wolfpack.” In the previous two films, the three friends’ attempts to plan a celebration have resulted in disaster for them, but led to a combined billion-dollar success at the worldwide box office.

In making the announcement, Robinov stated, “We are extremely pleased to have Todd Phillips and the guys back together again for another ‘Hangover,’ and we look forward to collaborating with them on another great movie.”

Phillips said, “I’m so excited to embark on another ‘Hangover’ film with Bradley, Ed and Zach. We’re going to surprise a lot of people with the final chapter we have planned. It will be a fitting conclusion to our three-part opera of mayhem, despair and bad decisions.”

Phillips is writing the screenplay with Craig Mazin, who also collaborated with him on the screenplay for “The Hangover Part II.” Phillips is again producing the film under his Green Hat Films banner, together with Dan Goldberg. Thomas Tull and Scott Budnick will serve as executive producers.

Production on the film is projected to begin in September 2012.