MouseSavers historical rates page says July 10, 2013. http://www.mousesavers.com/historical-information-on-walt-disney-world-resort-discounts/#rackThey used to do it promptly on the first Sunday of August. But the past couple years, it has been July, or even as early as June. I think it was June last year.
We are currently planning on staying off property next year, but I am still eagerly awaiting 2015 rates just so I can get the final total to see how much we will be saving.
Book over the phone. The online system cannot book what they haven't published rates for.
Register on WDWMAGIC. This sidebar will go away, and you'll see fewer ads.