"I can't let myself hurt them."
That's what Bruce Jenner tells Diane Sawyer in a new promo for his upcoming two-hour 20/20 special.
The 65-year-old reality star, and father of 10 -- six biological and four step -- says his family members "are the only ones [he's] concerned with."
Audiences have learned very little about the exact subject of Jenner and Sawyer 's interview -- possibly on purpose.
NEWS: Is the Mysterious 20/20 Promo for Bruce Jenner's Sit-Down Interview Done By Design?
Rumors have been swirling for the past year that Jenner's changing appearance, including long hair and reports that he shaved his Adam's apple, means he is transitioning to a woman.
But daughter Kendall Jenner said the tabloid rumors were all "bulls**t."
Bruce has made no official statement regarding his gender or any planned transition. However, his mother told the Associated Press that he sat her down for a long talk and what he told her was "a shock," but she was proud of him and would always love him.
In the new 30-second promo, a voiceover booms, "Bruce Jenner, on family" followed by Jenner saying, "Those are the only ones I'm concerned with. I can't let myself hurt them."
The voiceover says the interview will cover "the future, the decisions, the journey," but does not elaborate on what any of those entail.
A quote used in a previous promo is also repeated in this one: Bruce Jenner saying, "My whole life has been getting me ready for this."
The special will air Friday, April 24 at 9 p.m. ET on ABC.
Watch the first promo for the 20/20 interview: