I'm guessing that there may be long term plans for these, however it would be nice to see these, especially since we already have LMS and LNER locomotives in game. The Merchant Navy class may be a stretch with all of the locomotives being different, but I think a king class would certainly be a welcome addition to the game.
I would love to see Clan Line in game but only if steam physics are properly sorted including full control over firing rate and boiler replenishment and actual consumption of coal and water. Having had the privilege of travelling behind Clan Line after its Swindon Works overhaul in 1984/85 (when the test run set fire to half of Wiltshire, South Gloucestershire and Avon), she has a very distinct sound that must be captured properly.