There is no need for words here. Just watch the trailer. Tell me it doesn't take you back to the days of what I can only refer as "organic animation" of anime. Notice the little to no use of cell shading? Thats right, this is a mature looking anime. Just watching it, you start to get hints of Cow Boy Bebop all over the place. I would gamble that the same people are behind it.
And as if this eye watering animation wasn't enough, Yoko freaking Kano is the composer for the show. :P
This upcoming gem is called Zankyō no Terror.