Re: 'X-men: DOFP' Official CAST Thread (announcements and discussion) - Part 2
X4 is Days of Future Past.
Its the 4th film with the original cast and it is set after X3 so its automatically X-Men 4. Just because they are sharing the film with the cast of the First Class, its not X-Men 4 anymore.
Me. I Am Psylockolussus... The Elusive Mutant.