Raiders of the Lost Ark is heading back to the big screen -- but this time, it’s the really big screen. Paramount is re-releasing the classic 1981 adventure movie, directed Steven Spielberg , executive produced by George Lucas and starring Harrison Ford , in Imax theaters next month, ahead of a splashy debut on Blu-ray. INDIANA JONES: THE COMPLETE ADVENTURES Blu-Ray Arrives September 18th- Paramount has not made any official announcement, but the movie already is popping up on various ticketing and theater websites as an attraction opening Sept. 7. Fandango, for example, has it listed at the AMC Century 15 in Imax for that date. An announcement is expected this week, according to several sources, and website Screencrush reported that its sources confirmed the impending re-release. Paramount did not immediately respond to requests for comment, and it is unclear how wide a release is being planned and what sort of campaign the studio will mount. The studio is releasing the I