Disney California Adventure will be opening a "completely immersive superhero universe" in the form of a Marvel-themed land in 2020. Last year, Disney Parks announced a couple new Marvel rides were on their way to the Anaheim resort, but this is the first announcement that there will be a whole section of the park dedicated to characters from the MCU.
The Marvel land is expected to replace the area occupied by A Bug's Life rides, including the "It’s Tough to Be a Bug" ride which closed earlier in March. The sparse announcement says the land will "begin recruiting guests" in 2020 with "even more new experiences to follow."
While it's exciting to have a new land dedicated to one of Disney's largest cinematic franchises, it doesn't look to be anywhere near the scale of the upcoming Star Wars "Galaxy's Edge" park or its wildly immersive Star Wars hotel. The details are a little sparse other than that the Avengers and Spider-Man will be involved, and maybe Black Panther as well, based on the character being in the teaser poster alongside Peter Parker's alter-ego.