No it was certainly a human like character and most likely it was thrain. I studied the trailer and definetly has a beard and a human-like nose (very very unusual for orcs)

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'Though my memory's fading, I remember two things very clearly: I am a great sinner and Christ is a great Savior'
-John Newton

I think its because he has been exposed to a dark power causing the mindlessness. Just as Theoden looked when influenced by the dark power of Saruman. The grey skin seems a visual way to get that across. Pure speculation of course.

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You don't have to be great to start. But you do have to start to be great.

They already changed this when they had Gandalf not know about Dol Guldur until Radagast tells him in the movie and shows him the Morgul Blade.

That would have to be Thrain in a flashback as Gandalf got the key and map from Thrain in Dol Guldur.

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"Leave Sauron to me."
If you're in the Raleigh, NC area, let me know.

Are you talking about the movies timeline (which changes several key things in history) or the Book timeline. For the Book you are correct but in The Hobbit An Unexpected Journey (the Movie) they changed several things in the history. First of all the Council knew of Dol Guldur in the books for, I think, about 100 years, There was no White council meeting when Bilbo was in Imlandris with the Dwarfs as this happened before the Company set out, Galdalf was only to accompany them to the Edge of Mirkwood do to the business with Dol Guldur (in the movie he is taking the whole trip with them, remember in the book one of the important reasons they allowed Bilbo to come along was to remove the unlucky number of 13 as Gandalf didn't count among the company), And the Witchking was never locked away (while in the movie they have a line in there about him being entombed and powerful magics placed on his prison), and Radagast had to convince Gandalf that Dol Guldur was occupied by a powerful Necromancer.

So given the fact he knows nothing about the stirrings in Dol Guldur, how could he have gotten the key and map from Thrain while imprisoned with in Dol Guldur? That is if your talking about the movie over the book and appendices or the first movie doesn't add up with the next two about Gandalf not knowing about the Necromancer.

I'm talking about the book. I have no idea how they're going to explain how he got the map. But I'm sure that that is Thrain as they said that he disappeared at the battle, the only reason I can see why they would say that is to set him up to attack Gandalf like that. From what they showed of him in the movie, I got the feeling that he was a very great warrior and wouldn't just die.

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"Leave Sauron to me."
If you're in the Raleigh, NC area, let me know.

It could still be a flash back I guess, you could have Thrain stabbed with a Morgul Blade or corrupted and attack Gandalf where Thrain gets beaten and before he dies gives gandalf the key and map, this would explain where Gandalf obtained it and just moves the location of their meeting while giving Peter Jackson his additional fight scene. (keep in mind this is all conjecture on my part)