Re: We Need an X-Factor film
I'd guest call the X-Force movie "X-Force" myself.
Wolverine: Omega is a cool titles. I also think that "Wolverine: The Savage Hunt" or "Wolverine: Blood and Snow" could work as well.
X-Factor could simply be "X-Factor" as well, although "Mutant Massacre" is a good subtitle if they want one.
I'm pretty sure that Marvel owns the rights to Kang, so the Fantastic Four movies couldn't use him. I was thinking "Fantastic Four: Annihilus" myself.
Age of Apocalypse could also work as the big X-crossover.