When we were there last Tuesday and they were doing cast member previews, they shut off access at the right turn by the Hyperion and were funneling people through the Hyperion for the previews, so "regular" guests didn't have access to GOTG. It was kind of frustrating because we hopped over from
Disneyland promptly at 1 and went to Soarin first since it had a short line, only to go to Hollywood Land and find that GOTG had closed at 1:30 -- I didn't think to check the operating hours.
In the "grand opening" ceremony last night they certainly made it seem like GOTG was going to be part of the campus, which does make it frustrating if access will be restricted based on land capacity (although that area does give them more area to spread people out and potential increase the "capacity".