Not sure about the FR Black Edition being added but the FR Sport is still listed – might not be able to get one as a factory order but as its one of the more popular trims there’s a good chance a dealership will have one in group stock. Pretty sure its only a few minor tweaks like larger wheels and back wing mirrors but otherwise the same as the FR Sport.
The petrol Focus ST is over the BHP limit and given the current negativity around diesels it I’m not sure they would add effectively a diesel only trim but who knows, stranger things have happened on the scheme lol.