I'm skeptical about this:
1- Don't want to see Xavier, Mystique, Magneto and Beast stealing the show, they already had 3 movies as the main characters, how about others characters?
2- I'm not sure if they have the a good visual effect team to make a space movie. Guardians of the Galaxy 1 and 2 had some amazing visual effects in space I'm not sure that Fox can do it.
3. I wonder if Cyclops will lead the x-men finally. The only x-men movie that Cyclops was the leaver of the x-men was x-men 1 in 2000, 17 years ago.
4. Can they handle it visual effects better this time? A lot of people felt like the visual effects in x-men apocalypse weren't all that great.
5. The characterization of some characters are not done properly. I really hope that now that Psylocke is in X-Men Dark Phoenix they show her powers properly, she has both telekinesis and telepathy, show her using her freaking telepathy. Also, Jean Grey telekinesis is really really powerful, I'd like to see her lifting something big and heavy like Magneto did in all movies.
6. This movie has to be a 3 hours movie or else it will be like X-Men Apocalypse that got lots of important scenes cut like Cyclops and Havok talking in their home before arriving at the school, Storm talking to Xavier their reasons to join Apocalypse, Moira arresting William, the mall scene, a lot of good stuff got cut for the movie to get short. It has been proved that if the movie is good the audience will watch no matter what and many times, LOTR.