20th Century Fox has recently registered the name of the classic X-Men storyline with the MPAA Title Registration Bureau, according to Ain't It Cool News.
The organisation allows studios and production companies to claim particular titles in advance to prevent clashes and overlaps.
The popular two-issue 'Days of Future Past' arc was written by long-running X-Men scribe Chris Claremont.
It was set in a dystopian future where mutants were hunted and imprisoned in sinister camps, and saw an older Kitty Pryde transfer her mind to her younger self in order to prevent that future from occurring.
Fox CEO Tom Rothman recently said that more X-Men-related properties will be announced in the summer.
The X-Men: First Class sequel was recently given a release date of July 18, 2014.