Speaking with MoviePilot.de, Filoni says the series will see the return of classic Star Wars ships and he talked about how it differs from his previous work on "The Clone Wars."
"We will see many things that are famous to Star Wars, but have not appeared on screen in a while. Star Destroyers, TIE Fighters, and Stormtroopers – basically the Empire is back and that is a big change, since, for many years, we have only seen the Republic in action. The tone of the series is also different. The Clone Wars got very dark as we headed towards the end of the war and the downfall of the Jedi. Star Wars Rebels brings back the banter and faster pace that the original films were famous for."
Filoni also spoke about the setting for the series, the new planet of Lothal.
"Rebels takes place in the Outer Rim. The audience typically thinks of Tatooine as the place where Luke Skywalker grew up, when the Outer Rim is mentioned. We are on a more civilized planet, and one that profited from the Empire's existence in the beginning. Most of the stories take place on the planet Lothal, which is a grass planet with large monolithic stones on the surface. The look comes from some Ralph McQuarrie concept paintings that were done for the original Star Wars films. We tried to make Lothal look and feel like a planet that would have been in the original film trilogy. It's alien, but you feel like it's someplace that you could visit on Earth geographically. Hoth, Tatooine, and Endor are all like this, so we think it fits in well."
The only confirmed character for the series was the newly-created villain The Inquisitor, but now Filoni has revealed another character for the series, a droid named Chopper. You can check out the video below to learn more about Chopper.
Set between the events of "Episode III" and "IV," "Star Wars Rebels" will be produced by Lucasfilm Animation, featuring many of the key talents that made "Star Wars: The Clone Wars." It is scheduled to premiere in fall 2014 as a one-hour special telecast on Disney Channel, and will be followed by a series on Disney XD channels around the world.
UPDATE: Here's the official press release on the character:
In Star Wars, droids are always eager to help out their human masters, drop whatever it is they’re doing when called upon, and sometimes even sacrifice themselves to save others. Right?
Not quite. Introducing Chopper, a lazy, cranky (if ultimately goodhearted) astromech droid, and the latest character revealed from the highly anticipated Star Wars Rebels animated series. "If Artoo is the family dog,” said Dave Filoni, executive producer of the show, “Chopper is the cat." Chopper is an essential crew member of the Ghost, tasked with keeping the starship running and operable for its band of heroes. In reality, thanks to his many “unique” upgrades and customizations, no other alien, human, or droid could handle the job.
The design of Chopper, a.k.a. C1-10P, takes cues from early Ralph McQuarrie concept art for R2-D2, especially the expressive arms that fold out of his head. As Star Wars Rebels takes place four years prior to the events of Star Wars: Episode IV A New Hope, Chopper’s retro look creates an aesthetic continuity with droids of the original trilogy.
Star Wars Rebels is scheduled to premiere in fall 2014 as a one-hour special telecast on Disney Channel and will be followed by a series on Disney XD channels around the world.