Funny thing, I found this thread by asking that question in the Google search bar. Funny how the Internet boomerangs on me.
So know one really knows huh?
If I had to take a guess, it would probably be for September 22nd or 29th... although I'd like to make the latter the 15th, but it's usually not as early as I'd like.
BUT NEVER FEAR FELLOW BRONIES, THE TIME DRAWS NEAR!