What are the advertised benefits? Are those heat sinks to help cooling or is it just a design element for style? How much more capacity is it if any?
EDIT: I just talk to a friend at Mackin. They are the official importer for brands like Volk, Advan, ARC and others. He said they are aware of the part, the full retail price is around $600 and they can get it no problem. I don't think it's currently in stock since it's fairly new. I'm sure if you call them they can refer you to one of thier authorized resellers (they don't do retail). Contact info is on the link.
If I find out more I'll come back and add.