Castle Hill Prods. has picked up domestic distribution rights to comedy “The Next Big Thing.”The satire, helmed by P.J. Posner, stars Chris Eigeman (“The Last Days of Disco”) as a starving artist who finds himself hailed as the art world’s latest sensation. Castle Hill prexy of marketing and distribution Mel Maron brokered the deal with Carole Curb and Glen Reynolds of Curb Entertainment. Previous Castle Hill acquisitions include Calista Flockhart starrer “Jane Doe” and “The Last Man,” with Jerri Ryan.