Ford has filed a trademark with the EUIPO for the term "Mustang Dark Horse". I wonder if this for specific model or some kind of special trim or package?
A blacked-out "Dark Horse Package" has a nice ring to it I must say.I have no idea how long the EU trademark process takes - my cynical assumption is that it would be slow and the soonest we'd see this would be on the 7th-Gen
however...
Ford ran a contest earlier this month asking people to submit names for its "signature Mustang Black Accent Package" and this would seem like a good match to that.