I don’t know why people are referring to this as a leak. Sometimes researchers present ongoing studies at conferences before they get published in peer-reviewed journals. The abstract was put into a conference booklet for everybody who presented at the conference.
I’ve seen this kind of thing before for Melcangi or Belknap before their studies were officially published.
People really should stop asking when it will be published because it doesn’t do anything and nobody is going to post confidential information on the forum anyway.