Every Campus is part of an “interconnected story.”
Like Star Wars Galaxy’s Edge, which focuses on the new planet Batuu, Avengers Campus will involve an original story set within the Marvel Cinematic Universe–or, well, sort of set within the Marvel Cinematic Universe. Unlike Batuu which is functionally “time-locked” in a narrative sense to exist at a fixed point in the Star Wars timeline, Avengers Campus is set at some point or in some version of the MCU where Tony Stark is still alive and threats like Thanos apparently never happened.
There will likely be more news to come out of D23 Expo this weekend about the official story that will weave through all the different Avengers Campus locations, whether or not they’ll play into the bigger MCU multiverse, have something to do with the splintered timelines, or are part of something else entirely. Until then, we know that the Avengers are building these campus locations around the world, traveling from destination to destination, and using them as opportunities to train new heroes (i.e. park guests.)