Vulture said Jones believed the molestation deeply affected Houston, causing her to "question her sexual preference".
In the minute-long trailer, Macdonald uses an acoustic version of Houston singing the opening lines of her I Wanna Dance With Somebody spliced with the home footage to show a young woman who was struggling with her fame.
"That led somebody to tell me, 'Whitney told me she was abused, ' but they wouldn't go on camera", Macdonald said. But there's also never-before seen archival footage, exclusive demo recordings, rare audio archives and original interviews with her loved ones.
Warwick, who was 18 years older than Houston, died in 2008. In it, her brother Gary Houston is interviewed about Whitney. The film, which debuted at the Cannes Film Festival, also explores Whitney upbringing, her scandal-ridden marriage Bobby Brown, and her drug addiction.
Directed by Kevin Macdonald (The Last King of Scotland), Whitney is produced by Simon Chinn, Jonathan Chinn, and Lisa Erspamer, and executive produced by Nicole David, Pat Houston, Will Clarke, Andy Mayson, Mike Runagall, Zanne Devine, Rosanne Korenberg and Joe Patrick.
The Times's Ed Potton gave it a four-star review while The Telegraph's Tim Robey was more lukewarm, giving it three stars and writing: "The film is oddly unmoving as a memorial, but as with Amy Winehouse, it inspires a collective mea culpa for the feeding frenzy of public judgement that only turned to sympathy when it was far too late". She seemed kind of asexual in a odd way.
Whitney she had a long and well-documented battle with substance abuse, having made a number of disheveled appearances in the years before her death that shocked her fans. "She was handsome", she said, "her heart". Not necessarily in public, but I don't think that was a secret within the music industry.
The Guardian has contacted representatives of the Warwick family for comment on the allegations.
Whitney will hit theaters on July 6.
Sarah Rodman provided additional reporting for this story.