Uh, this isn't new, it's was shown in trailers and in the demo. Also, they don't show much to avoid spoilers (like they did with MoF), and we saw a little bit of the city in the E3 video (during the interviews before the trailer).
1. I have seen all the trailers, they have shown maybe 2-3 secs of an alley and the church.
2. A CG trailer doesn't count, I'm talking about gameplay. What you see in the trailer is a grey smoke teleport.
3. What he does in the demo isn't mist. Think of what Laura does in the DLC, that is mist.
4. If I am wrong please shoe me where there is mist.
Thanks!