Hoping it's pretty soon now. We found the August hours last year to be pretty similar to the July hours. Then, mid-month, about the 15th or so, the hours at MK started getting cut back.
Someone posted MGM hours awhile back on another thread dealing with August. How they got them? It was a reference to a website dealing with MGM.
When I spoke to a CM on the phone about a week ago she told me that the park hours would be released at the beginning of June so .... hopefully anytime!