Timely Update.
I think I have the picture of Shaymin's new form this time. This time its new form looks enough like an ice type. This picture was taken from Serebii.net (the same site that gave us the fake Shaymin picture). The badges in the below picture are meant to promote the 11th Pokemon movie which could probably mean that this is the 5th generation Pokemon that's sneaking its way into the 4th Generation (like Marill in the 1st Generation, Wynaut in the 2nd Generation, and Munchlax in the 3rd Generation).
I like the regular Shaymin better. This (supposed) new one looks kind of evil and weird.