Definitely starts looking like Shaymin's
getting an alternate version.
Anyway, as for the possibility of new moves... I'm wondering what the hell can salvage Shaymin at this point. Since they gave Roar of Time and Spacial Rend to Darkrai for seemingly no reason, is Shadow Force Shaymin around the corner? Just random speculation here, but if it turned out that way, what a letdown it would be. One, Shadow Force sucks (despite being a BIG improvement over Fly, Dig and Dive in the first place thanks to 120 power and hitting through Protect). Two, Shaymin's clearly special-based. Three, it doesn't have the special movepool to go "oh, that's enough specials, let's buff up physicals instead" like they did with Lapras.
By the way, the moveset posted for Shaymin seems to be bogus, as it's been erased from the page it's said to come from. Only thing that remains is the Micle berry.