Re: 'X-men: DOFP' Official CAST Thread (announcements and discussion) - Part 1
no, its the first X-Men Crossover of Fox and on the cinema to date, so to expect this movie to have just the same number as X2, being only the second film on the franchise... well, its not the same case.
The 70's wont only have 4 mutants. That would be a really poor adaptation of the era and the storyarc. And I highly doubt Singer plays cheap with the 70's.
Next Big X-Men Crossover
* 2017- X-Men: Age of Apocalypse
Edit: Forget about 2017:
Official announcement -> X-MEN: APOCALYPSE - MAY 27, 2016!!!!