I recall when everyone was saying that there was nooooo way Scarlet Witch or her brother there were going to be allowed in any avengers film, because they were mutants and Fox? [...? I don't follow the X-Men franchise] allegedly had title to any and all mutants, now and for eternity, etc.
But there they will be, smack in the middle of the Avengers franchise. If this is so, I really fail to see how adamantium will fail to make the cut, which isn't even a character to begin with. Unless, as previously mentioned, it was specifically included in the licensing agreement.