Pokémon Sun / Moon's favorite wolf Pokémon is back at it again with a new form. Coming in Pokémon Ultra Sun / Ultra Moon, Rockruff will also be able to evolve into Dusk Form Lycanroc. Lycanroc already has a Midday form and a Midnight form - both of which are obtained depending on which version of the game you're playing, and what time of day your Rockruff evolves.
That being said, we won't be able to catch this new, orange Lycanroc in the wild. It will be caught by some other unannounced means. While a little less than groundbreaking; this marks the first (somewhat) new Pokémon to be announced for Pokémon Ultra Sun / Ultra Moon, which will be released on November 17th.