While the first part is set for January 2015, second part in Summer 2015 and the third part in Winter 2016, the first teaser of Durarara!!x2 was shown at the Dengeki Bunko Fall Festival. When you look at the trailer, you can clearly see the changes in the stylization, seeing that the project has been handed to the relatively new Shuka rather than Brains Base.
Personally, I think it looked a bit…weird, at first. But I will get used to it hopefully. The background music and large cast reminded me of Hamatora, which is not a good thing.