I think Melita are correct about it not being quite read for booking, but it's nice to know it's there. I was basing my assumption on click in the "manage" tab and having it looped back to the main page...EDIT: but just tested again and it does show me with "no appointments" So nice.
Having said this, having been impatient in the past and have used apps when they haven't been announced quite yet, I know that sometimes early activity is lost. So I would suggest waiting a until the notice goes out, the week of July 13, or at least a few days.....my suggestion anyway.
Edit 7/16/15 : I just set up an appointment and received the confirmation email....hopefully this is active and ok to use. ??