Luke Bryan doesn’t know if he’ll be returning to ‘American Idol’. The 47-year-old singer admitted things are “interesting” on the show at the moment because not only are he and fellow judge Lionel Richie being kept in the dark about who is going to replace Katy Perry on the panel following her recent departure, they still haven’t been told if they are keeping their jobs. He told Billboard magazine: “It’s been interesting. “It’s been something Disney been really tight-lipped about with me and Lionel and [host] Ryan [Seacrest]. We currently haven’t heard what the story is on who’s coming back, a…