The most interesting thing I'm finding with the tidbits I'm hearing about the new film is that more and more of it seems to be inspired by recent X-menish comics, (those of the past 5/6 years), rather than the historical 'classic' ones.
Alot of the Magneto rallying bits seem to be from Ultimate X-Men arcs, "return of the king" and "the tomorrow people", the aforementioned, "gifted" and District X's "mr m" are cure related, Morrison's now infamous "planet x" has echoes of a wolverine/magneto/phoenix confrontation(s), and I see shades of Frank Tieri's Weapon X with the more obscure mutants and the prison camp etc...
On the same token, mutant prison camps, cures, phoenix's, mutant armies and characters such as Arclight, Leech, Quill (yes the captain britain one), Callisto, Moira and Multiple Man have been around for a LONG time.
In fact there are a lot of Excaliburian era mutants in this film.. (?)
And some Australian X-Men era mutants as well.. (?)
But with that said, in some cases, the modern X-Men stories seem to be a little bit more 'mature' and less sci-fi than the classic ones, so perhaps that's it.