It might end up coming out next year. The Sneak Peeks have predicted late-year releases before only to have the movie show up the following January or February instead.
"If I'm going to have a past, I prefer it to be multiple choice!" - The Joker

So excited to see this, finally get to see Swamp Thing and Constantine in this universe, the animation looks great. I'll be pre-ordering this and hopefully it makes enough to warrant more films like this live-action or animated. I thought this was coming out next year, but if it comes out this fall even better, there was alot of footage already finished so it could be close to being done.
"Come in, dispatch. Send more paramedics."

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I knew Batman would be in this, but part of me didn't want any of the more familiar characters to appear.
Looks okay, though. I look forward to seeing Swamp Thing in a movie again.
http://www.freewebs.com/demonictoys/

Deadman sounds terrible

Felix Faust is definitely the villain in blue in the trailer. They just slapped a lame mustache on him.
The medieval times threat is seen as a human early in the sneak peak and later, returned in a more monstrous form. He looks like a direct ripoff of Corypheus from Dragon Age. I'm guessing Felix has some role in his return.
Also, Merlin is likely the old mage in white who was fighting the medieval villain, thus the connection to Etrigan.