I personally thought it was just a case of fans reading too much into things so I asked Aaron about the photo.
Aaron said that the actors were all there at the same time for the photo. He's not even sure Ron had anything to do with it because Ron was not at the photo shoot. He said that they did probably six different set ups and they just happened to pick that photo to publish in EW. He said that there is no hidden meaning to the photo and the actors got up walked around changed places and did what they wanted to do.
EDIT: A post from Aaron about this.