Re: what's next for X-Men (movies)? [non DOFP spoiler zone]
They pretty much have to do something with Apocalypse at this point. He's pretty much the only one of the three most well know (to me at least) X-Men enemies they haven't done yet. The other two would be Magneto and the Sentinels.
They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance. - Terry Pratchett, Equal Rites