text: ABC released a fourth promo video on Thursday on the eve of Bruce Jenner's sitdown interview with Diane Sawyer airing in which he is expected to talk about his gender transition. The 30-second clip opens with the 65-year-old former decathlete greeting Sawyer at his home. Bruce - the ex-husband of Kardashian matriarch Kris Jenner - appears somewhat anxious as he tells the Sawyer: 'It's going to be an emotional rollercoaster, but somehow I'm gonna get through it.' Scroll down for video... Nervous: Bruce Jenner is seen greeting Diane Sawyer at his home in the latest promo video released on Thursday ahead of the airing of his sit-down interview in which he is expected to address gender transition . Resolute: The former decathlete tells the journalist that it is 'going to be an emotional rollercoaster but somehow I'm gonna get through it' The video then included a previously aired snippet of him talking about his family. 'I can't let myself hurt them. They're the only ones I'm concerned with,' the reality star says. The video then shoots to footage of Bruce's older children; Burt, 36 and Casey, 34, (from his marriage to Chrystie Crownover)  along with Brandon, 33, and Brody, 31, (from his marriage to Linda Thompson) who all appear in the latest snippet from the show. Another frame includes a photograph of him with daughter Kendall, 19, and Kylie, 17, along with his stepdaughters Kourtney, 36, Kim, 34, and Khloe. 30. It ends with Bruce looking to the future, and asking how his 'story' will end. He says: 'I wanna know how this story ends, you know? How does my story end?' Looking to the future: The clip ends with Bruce asking 'how does my story end' ABC has kept a tight lid on Friday's much talked about broadcast, only releasing a couple of non specific quotes from Bruce. The network is not expected to reveal much more in advance of Friday's program, preferring to give him the opportunity to address the topic in the full context of the interview. Sawyer has not spoken to outside media about the interview, which was conducted in February — one day in Los Angeles, another in New York. She's scheduled to promote it on ABC properties on Friday: Good Morning America, Live with Kelly and Michael and The View. ABC News executives also haven't spoken about it, not even confirming publicly until April 6 that the interview had taken place, until this Friday's airdate was set. Tight lid: ABC has only released snippets with non-specific quotes from Bruce, paving the way for his story to air in full on Friday's air date . The tight lid enables ABC to avoid the touchy issue of potentially 'outing' a public figure before the person has had a chance to publicly address the topic himself. Not everyone is waiting: The New York Daily News on Wednesday published a front-page picture of a person they said was Jenner wearing a dress. The approach has left his syndicated entertainment newsmagazines starved for news. Bessey said they've done stories on the three 15- or 30-second promos that ABC has released. The first ABC promo showed two Jenner images — one from behind and the other from the side as he talked with Sawyer, his face obscured by shadows. In the second and third Jenner is heard more clearly, and with two soundbites. 'My whole life has been getting ready for this,' he said. He also talks of the importance of not hurting his children. Moral support: The 65-year-old father-of-six appears alongside his four oldest children  Burt, 36, Casey, 34, Brandon, 33, and Brody, 31; the latest clip reused this previously aired footage from another promo . The interview was conducted before Jenner was involved in an auto accident in which another motorist was killed. ABC is expected to address the topic, although the timing precludes it from being raised with Jenner. Some of Jenner's children, pictured in one of the promos, are also expected to be interviewed. Bessey predicted big ratings for the special. ABC is airing it on a Friday night, when TV-watching is usually low. Two big interviews are among the top 100 most-watched telecasts of all time in the U.S.: Oprah Winfrey's 1993 talk with Michael Jackson, seen in 36.6 million homes, and Barbara Walters' 1999 interview with Monica Lewinsky, seen in 33.2 million homes. Friday's interview likely won't approach those numbers, but should certainly exceed the Friday 20/20 average of 6.2 million viewers this season. Bruce Jenner The Interview airs on ABC on Friday 24 April at 9/8C. Not appearing in the interview: Kim, 34, Khloe, 30, and Kourtney Kardashian, 36, as well as Kendall, 19, and Kylie Jenner, 17, are not scheduled to talk during the interview .
target: ABC has kept a tight lid on details but interview is expected to address Bruce's gender transition .
  Network has only released non-specific quotes so as to allow Bruce to address topic in full context of Friday's interview .