An image of Dan Radcliffe and David Yates on the 'Order of the Phoenix' set has emerged. The fan-taken picture is from the video message that was played at the San Diego Comic-Con. It shows Dan and David sat in Professor Trelawney's classroom, with Dan in his Harry Potter Gryffindor costume. You can view the picture here. Information about the video details can be found here.

Source: The Leaky Cauldron