User blog comment:BlindmelonKen/Fox's Marvel Cinematic Universe?/@comment-112155-20140215221446/@comment-107.200.114.216-20140215224914

I remember reading an article from a year ago when Joss Whedon was discussing Age of Ultron and Quicksilver, he said if it ever came to point where the X-Men films had to tie in the MCU, he had a plan for it to make "tie-in" the best possible way he could.

Also, there's a leaked script rumor for Days of Future Past film to end with the events of X-Men 1 - The Wolverine splintering off into a different timeline (possibly as a way to explain the continuity errors in First Class), with the future being left uncertain for the younger First Class cast and that anything could happen. Seems like the perfect opportunity for Marvel Studios to make a deal with Fox if this is true, since The Wolverine sequel seems dead with Hugh Jackman refusing to play the character again.