I was trying (but failed) to find a picture of the new sign that - if I remember correctly - includes a reference to boarding being in the order listed. It's not evident in the photo a few posts up.
See this post
http://www.flyertalk.com/forum/25080755-post120.html. The photo shows the writing at the top of the sign explaining the process.
Those signs have been at T5 for well over a month.