Re: Any word on if this is going to resolve continuity issues from First Class?
With First Class, I feel they missed out on an opportunity to completely reboot the whole X-Men cinematic universe. By sticking to the X1-3 films, they're really limited to what interesting characters they can use for sequels.
I can see DOFP doing what Abrams' Star Trek film did. By having merging/altered timelines, they can recast any character they want to by the end of the film. I can see DOFP with the X-Men consisting of a more recognized cast of characters (if not actors) for the team/school (ie original team etc).