What I'm trying to say is that the release date has absolutely nothing to do with a bad team.
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And of course a game can be in development before it is officially announced. But it makes no sense to start a new game if the previous version isn't even released, not only because the AC-team has enough work with AC:3D.
Not sure what you mean by a bad team. I just meant a different team, which *could* allow them to work on both games simultaneously. It's not unheard of. New Super Mario Bros. Wii came out in November 2009 and then Super Mario Galaxy 2 came out six months later. We don't know what Nintendo has been working on, but surely they have multiple unannounced Wii U projects in the works. And it's possible that some of those projects could have been in the works for years. I'm not saying it's likely we'll get a Wii U AC game soon after the 3DS game, but I don't think it will take four years either.