Warner pushes back release dates for Green Lantern, Sucker Punch!

With no lead officially cast in Martin Campbell's Green Lantern movie, Warner Brothers has pushed the film's release back six months, to June 17, 2011, from Dec. 17, 2010, BoxOfficeMojo reported.

It's not clear whether this will affect plans to begin shooting in Australia in September.

The studio has also moved Zack Snyder's upcoming fantasy action movie Sucker Punch! to March 25, 2011, from October 2010. Snyder's fantasy movie, Guardians of Ga'Hoole, meanwhile, will come out Sept. 24, 2010.

Warner also announced a Nov. 18, 2011, release date for George Miller's sequel to Happy Feet, called simply Happy Feet 2 in 3-D.

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