ABC News is trying gamely to help the network plug holes on its fall schedule. News execs trekked to L.A. last week with a one-hour pilot, called “Hip Pop,” described by one source as a “featurey weekly hour on the entertainment business.” Hosted by Lisa McCree, a KABC anchor who earlier hosted the web’s overnight “World News Now,” the show was pitched as a fourth news hour for the network. Sample segments in the newsmag, assembled with just three weeks’ lead time, focused on the summer movie competition, special effects and a new emerging “rat pack” of Hollywood actors. The proposed show would also cover broader pop culture topics. With several dramas competing for scarce one-hour timeslots, it’s unclear is what “Hip Pop’s” chances are; more likely is a return of Thursday’s “Turning Point” as part of a new rotating wheel of newsmag staples that would also include “Peter Jennings Reporting” and investigative segments with John Stossel.