Rumor StatusBlue Sky
Star Wars: Galaxy's Edge officially opened in Disneyland on May 31, 2019 and it opens August 29, 2019 in Disney's Hollywood Studios. When the land was created, dedicated expansion pads were put in place and rumors of expansion are already underway. Details are limited other than a time frame as far out as 2027. With anything that far in advance, this should be considered highly subject to change.
May 29, 2019: WDWNT.com is reporting that Disney is already considering expansion for Star Wars: Galaxy's Edge with a time frame of 2027.