User blog comment:Johnnybravo44/Age of X/@comment-61371-20101009023325

To quote something from NYCC:

Finally, the panel announced a new event for the X-Men called "Age of X" which Singh described as "The end of mutants as we know them" before teasing a similar hook for the mystery story (and its mystery cast who were teased as silhouetted figures) to the well-known "Age of Apocalypse" story which temporarily rewrote the timeline of X-Men comics.