Did Hayley record a song with Chvrches?

Their Parahoy and Nashville performance might had been just an introduction to a very nice collaboration. Apparently, just a couple of minutes ago, Beats 1 played a studio version of Chvrches song “Bury It” featuring studio vocals of Hayley Williams! This fact wasn’t confirmed by Hayley or Chvrches but it’s spreading fast thanks to BuzzFeed and DIY Magazine. Was it a leak? Was it a studio version? When will it be officially released? Here are the questions with no answer.