It would appear that perhaps Harry Mudd may be returning to Star Trek: Discovery, at least judging by a tweet from Rainn Wilson, who plays classic Trek character on CBS's ALL ACCESS series.
"Guess who's back?!" the tweet begins from Wilson, which also features an image of two Orions on either side of him.
— RainnWilson (@rainnwilson) September 16, 2018
We know that Star Trek: Discovery season 2 is currently in production, and has an expected release date on Netflix in April 2019.