Sad news for Rebels fans, Dave Filoni just announced at Star Wars Celebration that season four would be the final season of the series. As he knows what it’s like to not be able to finish a series (Clone Wars), Rebels will end on their terms and will give the show a proper ending. He did stress that it’s not the end of what they’re doing with animation.
After that announcement they released the first trailer for the season which gives some cool glimpses as to what we’ll see. At Celebration they announced Warwick Davis will join the show bringing Thrawn’s Noghri assassin Rukh into canon, and we will get to see Yavin IV, Saw, and U-Wings this year.
While it was expected that Star Wars Rebels will eventually come to an end due to where it’s set in the Star Wars timeline, the ending of the show is sad. It’s really become pretty great in the last season and that bodes well for the finale.