I'd normally say that with each passing day the chances decrease that they will move park hours. BUT this is an unprecedented ride opening, and who knows, they could change park hours 1 day in advance, they could open the park (and BGs) early on the fly at 7:36am day of because there's just too many people. Anybody who answers this has no idea - you'd get as qualified an answer from a Disney bus driver at this point.
I'm not saying this to be rude, just saying that I don't think there's anybody here that can give you an accurate answer. If there's an answer that you want to hear, tell me, and I can say that though!