They should just pull a Man of Steel sequel and have the FF get introduced in X-Men 4

[Miken Ayers]

For no other reason than what the logo would obviously be.

 

[Dr. Evil]

X Men Four doesn't need to add four more heroes to the group that they already have. They have a lot as is, more than the Avengers.

 

[Quasimod0]

4X
lol

 

[jonathancrane]

The XXXX Men.
The Fantastic X.