The Kreon Silver Knight 5-pack is out in Asia, as I bought one off ehobbybaseshop's ebay store and it arrived today.
I thought it was just the Optimus that was redecoed to be a silver knight, but all five have "silver" (grey) decos... making it more worth it (if you go for these sorts of things and don't want duplicates).
It should be a Target exclusive in America (since it has Silver Knight to it), but I'd be surprised if it comes here.