A set of character designs, including a possible stage concept art, appeared on Malaysian production company Passion Republic's online portfolio: http://www.passionrepublic.com/en/work.html A company that has worked with AAA gaming developers and publishers before.
The designs are not credited in any way but clearly depict Soul Calibur characters. The fact that the designs are completely new and that there are some interesting changes for certain characters (like Natsu's corrupted arm and different weapon styles) could hint at possible Soul Calibur 6 designs.
The uncredited character designs:
A concept art called "Sacred City":
Source of all images from:http://www.passionrepublic.com/
Edit:
It turns out the designs were just an internal effort of Passion Republic to enhance their portfolio.
The designs are not credited in any way but clearly depict Soul Calibur characters. The fact that the designs are completely new and that there are some interesting changes for certain characters (like Natsu's corrupted arm and different weapon styles) could hint at possible Soul Calibur 6 designs.
The uncredited character designs:
A concept art called "Sacred City":
Source of all images from:http://www.passionrepublic.com/
Edit:
It turns out the designs were just an internal effort of Passion Republic to enhance their portfolio.