Everybody wants to know! I have been talking with Disney reservations on a daily basis since June 13th. I have been told everything from mid-August to end of September. Last week, I was told a couple of weeks. Lots of posters have said Disney has told them August 5th. Nothing with Disney is set in stone though!
If you have your heart set on staying at a particular resort, you might want to consider booking a room only stay. When the 2008 rates come out, you can do one of two things.
One: Leave it at a room only and the price will be adjusted to reflect 2008 rates.
Two: Change it to a package at the 2008 rates.
If you have booked a room only and wish to change it to a package, Disney will actually cancel your room only reservation, refund you the deposit, and rebook you as a package. You will be required to put up a deposit within fourteen days of the time you book the package. Because you had already booked room only, you are still assured of receiving the resort you want.
I went ahead and booked a 10 day room only stay at the Wilderness Lodge but will be changing it when the 2008 package prices come out.