I predicted the 28th I was close...Uiversal showed 6/30 as park opening but then took it off their site. Not sure if that was leaked early or yet another delay now!!!
I just got the message on my Facebook feed that Universal is saying that they "have not announced and official opening date yet". They have the media day coming up, and want to make that announcements there. I would bet that someone working on the site hit the publish button prematurely.