Don't know if this has been posted here already, but it looks like the Cyclops/Jean relationship will play a much more prominent role in X-men Dark Phoenix compared to X3. I know that's not saying much, but I find that very refreshing because that relationship is one of the most important driving forces in the Phoenix Saga. You really can't have a Phoenix Saga with the necessary drama and omit Cyclops/Jean. X3 tried and the whole movie suffered because of it. But the less said about that the better. Here's an article from GeekyRant depicting the role of the Cyclops/Jean relationship in the movie. And here's a quote from Simon Kinberg that should get Cyclops/Jean fans excited.
"The one mutant who never wavers from Team Jean is Scott (Tye Sheridan), a.k.a. Cyclops."
Simon Kinberg went on to say that keeping their story intact was extremely important to the filmmakers. He also explains that it's the emotional core of the film.
"That relationship, his being willing to kill or die for her, is a huge part of the emotional core of the movie. It also makes Scott start to have to become a leader."