There was also a panel focusing on the heroes of Rebels, and something even more special: they screened the first episode. I was able to attend, and though I didn't have low expectations, the expectations I did have were surpassed. When the episode ended, I was giddy. There's nothing like seeing new Star Wars for the first time, and when it's as good as Rebels was? I was over the moon. The series has a lot of heart, and if you're worried about Disney making it too childish, just stop. It captures the same dark overtones of the original trilogy, and there's still witty banter and fun.
Yes, it's possible to strike a balance, and they've done that here. I discussed some quick, spoiler-free impressions on IGN with Eric Goldman:
I also wrote an article about the screening at IGN: SDCC 2014: Thoughts on the First Episode of Star Wars Rebels
I can't wait for everyone to see this series in October.