“SNL” star Andy Samberg recently announced that he’s leaving the show — and he’s also planning his next project. During a press day at Sunset Tower in Los Angeles for his film with Adam Sandler, “That’s My Boy,” the funnyman let slip he’ll be joining the cast of a new BBC Three sitcom. “Cuckoo” will star Samberg as a lazy type who marries a British girl and struggles with his wife’s overprotective dad.