There is, in fact, another X-Men movie coming out. "X-Men: Days of Future Past" scheduled to be released May 23rd 2014.
Never. There won't be a fourth one.
No release date has yet been set.
'X-Men : Days of Future Past' has a May 23, 2014 release date .
X-Men - 1992 Family Ties 4-17 was released on: USA: 4 May 1996
X-Men - 1992 Courage 4-3 was released on: USA: 23 September 1995
X-Men - 2011 Transformation 1-4 was released on: USA: 22 April 2011
X-Men - 1992 Love in Vain 4-14 was released on: USA: 10 February 1996
Uncanny X-Men - 2012 Dazzler 1-4 was released on: USA: 7 March 2012
X-Men - 1992 Red Dawn 2-4 was released on: USA: 13 November 1993
X-Men - 1992 Xavier Remembers 4-16 was released on: USA: 27 April 1996
X-Men - 1992 No Mutant Is an Island 5-4 was released on: USA: 21 September 1996
According to Comicbookmovie.com the release date is September 15, 2009.