As first reported on JoeDios
from my visit to the Hasbro booth at Comic-con, the new HISS is indeed being manufactured in an all-black color scheme, as seen in this Ebay auction
I bet it will look even more amazing with the stickers applied.
Have you seen a GREAT POC HISS repaint? Post it as a reply to this thread. We'll collect all the best repaints of the current brown HISS we've seen.