Of course, it's Houston's mother, Cissy, who closes the trailer.
Gary Houston, Whitney's half-brother, also said he was sexually abused between the age of seven and nine by a female family member, in the documentary.
Houston died on February 11, 2012, at age 48 as he she was found unconscious in a hotel room bathtub.
Warwick, who was 18 years older than Houston, died in 2008.
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Director Kevin Macdonald told The Hollywood Reporter last week that Houston's memorable rendition of "The Star Spangled Banner" at Super Bowl XXV played a huge role in his decision to tell her story. She says, 'Mommy don't know the things we went through.' I said, 'Have you ever told your mother?' She says, 'No.' I said, 'Well, maybe you need to tell her.' She said, 'No, my mother would hurt somebody if I told her who it was.' She just had tears rolling down her face, and I just hugged her.
"There was something about her discomfort in her own skin, something about the way she presents or hides herself, her lack of overt sexuality", Macdonald told the publication.
"I thought that was a very odd thing, and it kind of reminded me of people I'd seen who had suffered from abuse, just in their body language and their sense of holding something back".
Check out the trailer as it teases revelations about Houston's longtime friend and assistant Robyn Crawford and the nature of their relationship.
The doc features sit-downs with interviews with the man credited with discovering her and building her career, Clive Davis as well as former Epic Records CEO L.A. Reid who touches on the struggle of supporting Houston's extraordinary talent in the face of widely-reported drug use. "She was attractive", she said, "her heart". "I think it's all about her family, really". You can check it out the Miramax and Roadside Attractions in theaters (in North America) starting July 6.
Representatives for Dionne Warwick didn't immediately return messages today.