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So don't take this as solid news yet, I haven't confirmed it. Or at least seen enough mentioning to make it seem legit. Could be just some delusional posts. Something was written on, I assume this month's Figure-Oh, that the next AY is Magneto. Also there will be another "member," which probably means another X-Men.
While I don't think it's true because Magneto only floats and waves his hands around so not really a Yamaguchi oriented character, I get that they want villains and he is a safe one to do. Plus we can see cape treatments, although with Magneto I think he has a pretty unique and fixed cape formation you could get away with easily with few big sculpted pieces.
It'll be clear in a week or so anyways.