If the season ends with the Battle Above Storms end as supported by casting reports and things in the trailers plus behind the scenes videos, Arrax will fill one of those 2 spots. Leaks were posted a while ago that covered the entire season and gave general descriptions of each episode. They were removed afterwards for a copyright strike. If those leaks were true Dreamfyre will be in the season as well. I won't specific what those leaks were per the rules of this subreddit. That fills spot 2. Pretty sure my "guesses" have more credence than the possible presence of Silverwing and Vermax, but you are free to believe as you wish. We will see when the show comes out