How do you know he was referring to the X-Mansion's cerebro? Until I see Magneto assisting Charles in the construction of Cerebro inside of the mansion, that hasn't been established at this point in time. Mechanical leg braces? It's fine that you're coming to your own conclusions, but once again, that hasn't been officially established and it appeared as though Charles was walking on his own. That's just like saying that the reason Hank McCoy appeared human in his easter egg scene during X-2 was due to a holographic image inducer. There's no fact about that, only assumption. Charles was even walking in Wolverine Origins, which was presumably set in the late 70's. And when did I say anything about altered timelines affecting character appearances? As a matter of fact, how do you even know that these altered timelines won't change character appearances(costumes)? I'm also wondering if they will eventually discard their FC cast so that the old cast will take center stage in future X-Movies set in current times, which I think would be a mistake because they have some great actors/actresses that can carry the franchise from now on. You're coming up with all of these reasons based on your own conclusions, not official movie canon.
Your post wasn't addressed to me, but I wanted to comment on it. We do know from the original films that a second Cerebro is built in the mansion and it seems logical that Magneto's powers would be needed in the construction of that big round room with all the metal panels.
You're right that we haven't seen it yet, though.
In a sense, both you and Dagenspear are right. You are right that there are unanswered questions, but it's also fair to say that some of the suggestions for answering them make sense. Fans of a franchise are always going deep into it and filling in the blanks themselves - this happens with all films and certainly all the films I see discussed on SHH. I've seen people coming up with explanations for the unanswered questions (and/or plotholes) in every single film debated on here. The Dark Knight Rises, Superman Returns, Looper, Avengers, you name it and it's been discussed and dissected to death!
Hopefully, Fox's attempts to create a shared universe prevents these questions, inconsistencies and continuity issues from occurring.
How do you know the FF won't affect the X-Universe? If Fox is planning to meld the two universes, then FF's events will affect or be mentioned in the X universe, and vice versa. Just like the MCU does to show that these heroes are in the same universe and how what they do is apart of a larger picture. Simple logic. I never said it wasn't possible, however I was asking what if Fox did meld the two universes together? Where would the FF have been the entire time that the X-Movies were happening? Would they be a new group, just coming onto the scene? Have they been away all this time? Or will they just start fresh on the Universe with both franchises? All of these questions are what I hope will one day be answered one day by Fox. Got anything else?
Yes, we don't know at this point how FF will feature in the shared universe. I'd imagine that they first need to be relaunched with a new origin story and new cast, before any crossovers occur. So I would think we won't see them meeting each other for a while yet, but I have no idea whether that's right.
Of course, Franklin Richards is part of DoFP in the comics, so it's possible he could appear there (but it would be a bit meaningless before we see his parents on screen first). It took six films before Avengers so it might take six films from now until an X-Men/Fantastic Four crossover (which would probably see them facing off against Galactus).
They could also have included Daredevil if they'd got their act together in time. Joe Carnahan's planned 70s-set film for Daredevil could have fitted in with a 70s era X-Men First Class threequel - maybe the newly-blinded Matt Murdoch, struggling to make sense of his new abilities, first went to see a specialist in superhuman powers (Xavier? Beast?). And Daredevil could easily have existed alongside Deadpool or Wolverine on screen. There would have been potential there. The danger is in making it feel forced, but then again all these heroes have met up and crossed over in the comics.