Scribe Theresa Rebeck has switched up the play she’ll be developing at the O’Neill National Playwrights Conference this summer, replacing the previously announced “Fool” with another new play she’s penned, “The Way of Things.”Rebeck (“Seminar,” “Smash”) proved enthusiastic about “Way of Things” when she arrived at the Waterford, Conn., campus of the Eugene O’Neill Theater Center, prompting the change, according to conference a.d. Wendy C. Goldberg. A contempo update of William Congreve’s “The Way of the World,” “Way of Things” centers on the bed-hopping scandals among the wealthy denizens of the Hamptons one summer. Goldberg, who was to have helmed “Fool,” will now direct “Way.” The O’Neill’s development process will culminate in public readings to star Kristine Nielsen, Laura Heisler and Jeremy Webb — who had made up the cast of “Fool” — alongside newly added thesps Bryan Dykstra, Sam Guncler, David Andrew Macdonald, Kate Nowlin and Katie Paxton. “Way of Things” reps the first time Rebeck’s work has been developed at the long-running O’Neill conference, which has played a role in launching new works from scribes such as August Wilson. Play, to be seen in readings set for July 27 and 28, is part of an eight-play slate for the O’Neill’s summer session, now under way.