Paladin of the Snow Queen
I think you mean "rock", not "fire".Yup, it is better late than never, compared to Kalos starters never getting Megas, and the only freaking Kalos Pokémon to get a Mega being a freaking mythical!!!
Well, the three that exist have names that are literally just copies of the name of the type "steel", "ice", and "fire", so I see no reason why that pattern wouldn't continue with something like Regidragon and Regilectric.
They couldn't have done it on time for November 2019, a deadline TPC forced on GF.