Star Wars Rebels Season 3 Trailer

Probably the most exciting aspect of this trailer, for me, was the exploration of Ezra's turn to the dark side. Rebels, for the most part, has felt a lot more cartoony than the Clone Wars for me, and with this the storyline is going to get more dark and dramatic, which makes me more interested in it.
But I have mixed feelings about Thrawn. It'll be cool to see him in the show, absolutely, but showing him now lets the audience see him as an underling instead of a leader like in the books. It takes a little bit of his influence away. Not sure how I feel about that.
Otherwise the trailer looks alright.

I feel that Mitth'raw'nuruodo has been portrayed in a battle proven leader role just by what I saw in the trailer. I do not think Tarkin would seek help from an underling. I am very happy to see Mitth'raw'nuruodo made it through the canon shredder. This opens the door for other Timothy Zahn artifacts to make it back into the universe. Mole Miners, Dark Troopers, Nogrhi, Ysalamiri, and my highest hope, The Chimaera.