Star Wars Rebels, which will air on Disney XD, is described as an “action-filled series”, set between the events of Episode III and IV. There was a lot of speculation about when the new Star Wars animated series would take place, with many assuming the most likely era was post-Episode VI, to lead into the new trilogy. Instead, as the title notes, Rebels occurs “in a time where the Empire is securing its grip on the galaxy and hunting down the last of the Jedi Knights as a fledgling rebellion against the Empire is taking shape.” There is about 20 years of time in-between Episode III and IV in the Star Wars timeline, so there are still plenty of questions about whether this will take place closer to Revenge of the Sith or A New Hope, or perhaps right in the middle...
Star Wars Rebels will first debut fall 2014 as a one-hour special on Disney Channel, with the ongoing series airing on Disney XD channels around the world.
I'm just guessing it's going to have the exact same animation style as Clone Wars... which is okay and all, but still kind of goofy. Still, lots of opportunity here.