Matt Roloff did an interview (video) with the celebrity gossip/news site Radar Online. They ask him about the end of the show, the divorce rumors and the Gosselins.
Matt says he is relieved that the show is ending. (If you haven't read already, you can read our article about the end of Little People, Big World and what industry insiders told us about the end of the show and Matt's subsequent comments (basically, we are told Matt's M.O. is spin -- http://spiritswander.blogspot.com/2010/08/tlc-cancelled-little-people-big-world.html
Back to the the Radar Online interview -- Matt laughs off the divorce rumors. He tells them that "Amy and I are still sleeping in the same room, in the same bed, with all the goodies that come with that!"
Matt discusses the heart attack rumors. His explanation is the editing showing his vertigo related dizzy spell combined with footage of him grabbing at his left shoulder. Of course, I think it's worth mentioning that probably the entire episode had something to do with fans getting that impression -- the episode featured Matt talking about his own death, where he wanted to be buried and how his death might come sooner than Amy expects. Then they went back in time, all the way to June of 2009 (most of those scenes were from October 2009) to finish season 5 with the dramatic collapse -- when actually viewers had been seeing Matt that entire season post collapse (the Europe trip, Molly's birthday and driving episodes and the pumpkin season stuff - all came after the collapse was filmed).
He's asked about the Gosselins. Matt talks about why the Roloffs survived reality show stardom and the Gosselins crumbled. He cites age and maturity as the main reason. He says when they met Jon and Kate he liked them very much, but could sense that they had problems.