The first of these is the “spark” trailer, and then there’s the “ignite” one. You won’t miss the messaging.
We had Chopper the Astromech there and Kanan, the first of the two characters to have received official profiles, but things were clearly focused on Ezra. I’m guessing he’s the protagonist of the feature length pilot at least.
I guess we’ll be introduced to his other chums soon enough, and see just how closely the overall set-up resembles that of Episode IV. My hunch is “quite a bit.”