At its core, The Disappearance of Eleanor Rigby is about tragedy.
After being teased about it midway through the credits of The Wolverine, we arrive at the next installment in the X-Men film franchise. Remember? When Logan returned to America, he received an unexpected visit from both Magneto and Professor Xavier. The two warned him about a severe threat to mutant-kind. Thus, we have X-Men: Days of Future Past.