Jean was killed in The Last Stand, but… returned as hallucinations of Logan in The Wolverine and then was restored to reality after the past was altered in Days of Future Past.
This film takes place in the alternate timeline spawned from Days of Future Past and continuing into X-Men Apocalypse.
Not much is known about the actual plot and the teaser trailer serves specifically to tease, but unlike The Last Stand, this version is supposed to have the X-Men going into space and the actual phoenix force bonding with her like the comics.
Outside of the last 3 or 4 minutes of the final episode, the 4-part X-Men Animated Series version of the Dark Phoenix Saga was shockingly more comic accurate than it had any right to be, considering the rest of the series. I’d say to track it down, but you first need to watch the 5-part Phoenix Saga from earlier in the season.
And if you want to play it super cheap, the entire Dark Phoenix Saga, the 2-part Days of Future Past and another dozen or so issues PLUS are included in X-Men Essential 2, available for $5…
Don’t feel bad. The second film, regardless of what people think, is “X2” not “X2: X-Men United.” The “X-Men United” part was added in the promotional material. Originally, the film WAS called X-Men 2, but the marketing team at Fox had it changed to X2 for some reason. If I’m remembering correctly, the “X-Men United” tag was to appease Bryan Singer.
Anyway… I have digital files of many of the films and it is annoying to have “Logan” “The Wolverine” “X-Men Origins: Wolverine” in the chronologically opposite order, as well as X2 after all the others.
I’m guessing part of the reshoots might be dealing with closing out the franchise, being that this will definitely be the final mainline Fox X-Men film. It already completed shooting before the Fox/Disney merger agreement was even speculated back last November. People keep saying it’s in massive reshoots because it’s getting awful previews. I want to smack then around to knock some common sense. It’s getting reshoots because ALL films get reshoots now, but they have to address the fact that this is the end. If you know how the Dark Phoenix Saga ends in the comics, you know they’re going to have to change it or fans will be really, really depressed that it does not unfold as foreseen at the end of Days of Future Past.