In 2008, Showtime confidently renewed Dexter for two seasons. That's not likely to happen this time, since key talent deals will need to be renegotiated before the show's seventh season. Expect the offical Dexter renewal within the next week or so.Though it still lags greatly in total viewers, “Dexter” on Sunday tied “Boardwalk Empire” for the first time in the 18-49 demo: