I watched it and went, "Wait a minute, what is Wolverine doing at D-Day?"
Then I realized that I know next to nothing about the X-Men...
I know a few characters, far fewer villains, and little of the storyline outside of Dark Phoenix and a bit of build up to that.
That was why the first X-Men film was bad for me -- it was made entirely for people who already knew the characters. The second X-Men film was brilliant, however, as you got to know the characters much better (and even got all their names).
So when I was done watching this trailer my feeling was, "Which way?"
If it is made with only fans in mind, I probably won't enjoy it; if it is made with people who have only heard of the X-Men, then I may well enjoy it, much like Iron Man, Dark Knight, and other superb superhero movies.