Nice look at the development of the series. Freddie Prinze Jr is something of an unexpected bit of casting, but the character looks cool. It's funny though, because Freddie's voice reminds me somewhat of the voice actor who played Anakin Skywalker in Clone Wars, Matt Lanter.
As for the character of Kanan? He reminds me slightly of the central character from the Dark Times comic series, Dass Jennir. But with Jedi being on the run from the Empire, I would think there's the potential for some recurring themes when it comes to former Jedi characters. Still, he appears like he might be a little young given when REBELS is supposed to take place. Was he a padawan when Order 66 was issued? And it also seems clear that at some point he's going to have a lightsaber duel with the Inquisitor. I'm hoping those scenes will be cool, but shouldn't scenes like that be few and far between?