that depends on whether the movie is good and whether the fans accept it as canon. if it sucks we will pretend does not exist like the prequels and the special editions.
Sure george and steven can say its canon until they are red in the face but if it does not fit the first trilogy its complete garbage and a cash in.
really makes me wish that the script was written by larry kasden who retired from screenwriting after return of the jedi and body heat.
his 300 page script for raiders is actually better than the filmed movie and more serious and less campy, it is up their with the dialogue of casablanca. it had the mine cart sequence in it and everything, that was of course saved for temple of doom.
i often dream of how great return of the jedi would have been had Gary Kurtz stayed on as producer, if it was directed by Kershner and written by Kasden rather than just add quick touch up to george's script.
It could have been serious and entertaining in the same way as Empire Strikes Back, which George says is the failure of the series.
the six movie saga story of darth vader is revisionist history and a lie. it was always the adventures of Luke Skywalker as far back as the early script where it was the adventures of Luke starkiller. it was intended to be at first 12 then 9 film series. six of the films would have starred the middle trilogies cast. since their salaries must have gotten bigger on return of the jedi i can see why lucas decided to get a new cast and do the earlier episodes without mark hamill.
Besides the fact that the films are all fiction and i am very aware of the fact, Luke Skywalker was a better hero to cheer on, and a better role model for children unlike a mass murdering killer of younglings, and whiny emo bitch like hayden's anakin.