The upcoming fourth season of HBO's The Sopranos — slated to kick off Sept. 15 — will delve into Tony and Carmela's dysfunctional relationship. "This year focuses on Tony and Carmela as a couple, on their marriage," series creator David Chase told reporters at the Television Critics Association press tour in Pasadena, Calif., on Friday. Chase also confirmed that next season — the show's fifth — will be his last. HBO, however, could continue on without him. "I wouldn't say it's irrevocable. If [HBO execs] decide to go on, from a business standpoint, they could." That's unlikely, considering that James Gandolfini (Tony) wants no part of a Chase-less Sopranos: "I started with him, I'd like to finish with him." Added co-star Lorraine Bracco (Melfi): "Same for me." For more on the fourth season of The Sopranos, read Insider tomorrow.