Yeah, I had the same issue about the Pig too, on the other hand, there's a lot of black on it, so we could have Ganon on our hands, hopefully.

I do like the Grass one a lot, it fits the snake theme a bit more and is my favourite of the bunch.

I only really have issues with the Water one, it just seems so... like a random odd Water-y Dialga + horn + mustache creation rather than an actual evolution of Mijumaru/DerpDerp. This also seems to be the one that most people have issues with, and is a stronger hint to me that these could be faked. But I could be wrong.
If they're real, Grass for me, because it looks pretty awesome as is.

Edit: Also, this:
img39.imageshack.us/img39/3883/fakepl.pngAnd this:
i53.tinypic.com/2dt92bq.jpgThis too:
i51.tinypic.com/e97wp0.jpgAgain, going to wait and see for total confirmation either way. Serebii specifically noted that there was a confirmation on the final Water evo, unfortunately- that's the most controversial one and the most disliked, from the looks of things.