Originally Posted by BMM
Unfortunately, for those of us who want Storm to return in some capacity, Days of Future Past makes it very easy for her to be absent. She could very well be killed between films, which would only speak to the devastating nature of the dystopian future.
Also, the fact that she was made the new leader in the last film would actually be an indicator that she will have died in this one, seeing as both leaders of the X-Men in the comic (Professor X and Cyclops) were dead in the future. It adds to the chaos.