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This was "leaked" as a new forme for Shaymin. The hype for it didn't last though, and people stopped caring...until a few months later they actually did announce a new forme for Shaymin.
Also, related: a lot of people thought that Shaymin-S's typing was going to be Grass/Ice, due to the japanese title of its debut movie being "Giratina and the Icy Sky Warrior" or something like that.