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.