Spider-man 4 was to be released May 5, 2011.  Reports have surfaced in the last few days that delays have hit the film leading to speculation that it won’t make the intended release.  But, stepping in to save the day for Marvel, Kenneth Branagh’s Thor is moving up it’s release date from it’s originally intended May 20th.

This caused a shift in other movie releases as Disney’s Pirates of the Caribbean: On Stranger Tides swooped in to take Thor‘s former date of May 20th, giving it a one week lead on assured blockbuster The Hangover 2 which opens Memorial Day.

Variety has reported that Paramount hasn’t totally given up on releasing Spider-man 4 on it’s intended date, but with Thor already moving and it’s former date now taken, it’d be up in the air as to what Thor would do if Spidey made it’s date.

2o11 is slated to be a busy year for blockbusters.  July 4th will see the next installment in the Transformers series and the final Harry Potter installment will hit the screens two weeks after that.  The First Avenger: Captain America is set to come out July 22, 2011 (though the 4th would of been perfect synergy) and Warner Bros. and DC have claimed June 17th for the Green Lantern film staring Ryan Reynolds.