Actor Jamie Campbell Bower attended the Serpentine Gallery Summer Party back in July, and was interviewed about his future projects, including
Deathly Hallows and
New Moon.
Jamie noted specifically that although Dumbledore had been outed as gay by J.K. Rowling two years ago, there will be no reference of the late headmaster's feelings for his character, Grindelwald, in the films. He said that there may be subtext, but it is not implicit in the actual movies. The video can be watched below.
Photos of Jamie from the gala can be seen
here:

