About the title, if they don't want to use "Age of Apocalypse" because transformers and Avengers are already using the "Age of " for their films.
How about "X-Men: The Apocalypse"? Its simple yet striking.
X-MEN RI5E' MUTANT OF THE MONTH | BEAST | PORTRAYED BY KELSEY GRAMMER
"Wolverine, I heard you're quite an animal" - X3
"Good morning Logan, late start" - X4