I´ve just heard news about this Arnold Render. It is the first time I hear about it but it seems that it exist already for some time. Supposedly it was used as a render for Monster House and Cloudy with a Chance of Meatballs and is being developed by Sony Picture Animation.
It looks like Sony´s reply to Pixar´s Renderman. Check this out:
I need to add that it has been used already by a great blender-head, Daniel Martinez Lara from Pepeland.
It would be nice Daniel, if you could tell us a bit more about this render. I would really appreciate it.