Star Tours is not part of Star Wars: Galaxy’s Edge, but when the new sequence for Star Wars: The Last Jedi debuted on November 17, 2017 it included an ending inside the planet of Batuu, the location of Star Wars: Galaxy’s Edge.
It is unknown if Disney will continue to run with the loose connection of Star Tours to Star Wars: Galaxy’s Edge. Additional possibilities would be a new theme to the attraction.
September 8, 2018: WDWMagic.com user marni1971 is reporting that there is some discussion of removing the Star Tours building (and ride) at some point in the future.
November 17, 2017: A new sequence debuted on Star Tours: The Adventures Continue featuring Crait from Star Wars: The Last Jedi. The Crait scene is the second destination of the attraction, but the scene actually ends on another planet, Batuu. This has led to some speculation, including a possible “last minute change” introduced by WDWMagic.com user MagicFeather that Disney would integrate the existing Star Tours attraction into Star Wars Land. This would be achieved by a tunnel that would connect the exit of Star Tours to a new entrance into Star Wars: Galaxy’s Edge. This information is unconfirmed, but the ending to the Crait scene does present an interesting change.
November 13, 2017: WDWNT.com is reporting that when the new scene based on Star Wars Episode 8: The Last Jedi debuts on November 17th it will result in an additional change to the attraction. According to the report, the attraction will differentiate between content from Star Wars Episodes 1-6 and Star Wars Episodes 7 and 8 (and ultimately beyond).
Beginning on November 17th, guests will only experience characters from the recent movies, but at a later point in time guests will have the option to choose whether they want to ride the attraction with scenes from Episodes 1-6 or Episodes 7-8.
The new sequence based on Episode 7-8 will feature a new opening sequence, the Jakku scene that debuted in 2015, a transmission (the existing BB-8 transmission or potentially an alternate) and the 2017 Crait scene.
April 15, 2017: WDWMagic.com user marni1971 is reporting that Star Tours should get an Episode 9 update in mid 2019 and run for a year or two after that before a replacement is considered.