Production on Star Wars Rebels Season 4 is underway, and it will arrive this fall.

Star Wars Rebels Season 4 is happening! Season three is in its home stretch at the moment, with only five episodes left as of this writing. But production on Star Wars Rebels Season 4 is "already underway."
“The team behind Star Wars Rebels delivers epic storytelling that has captivated fans of all ages across the globe," Marc Buhaj, senior vice president, programming and general manager, Disney XD said in a statement when the news was announced earlier in the month. "We’re excited to continue sharing the journey of these fan-favorite rebels with our audience in the fall.
More details about Star Wars Rebels Season 4 will be revealed at Star Wars Celebration in Orlando this April. We'll update this post with more details when they become available.
You can keep up with our ongoing coverage of the show right here.
Star Wars Rebels Season 4 Release Date
They haven't announced an official date yet other than "this Fall" so it will probably arrive in late September like season three did.