Movie version of Surtur would be my guess.

Yeah dojen agree

I had been saying all along that the "shadowy enemy that predates the universe itself" being touted in the synopsis was none other and I'll say it for the hundredth time it's SURTUR. The link to the picture even gives a brief description of how this character was acting which furthers my belief even more
 

Although he's not a "bad-guy", I'd like to see Beta Ray Bill make an appearance.

 Looks like Satan is having a yard sale.  

 This is being filmed in Greenwich, literally 10 mins from my house for the next week or so! I have a few days off now and know 2 people who are staying at the uni campus. Will try to get in and see what I can see.

I agree...Surtur seems most likely. 

How do we even know its a bad guy?

Sutur all day long. We talked about this months ago Wise...

It's Mokiki doing the sloppy swish

He does the sloppy swish?