I like this series a lot. I think it was pretty clever also to make the "no power" thing obviously a macguffin there to get the real story rolling as well. They marketed it around that hook but it looks like the series is going in a completely different direction using that power outage as a jumping off point...
As WhiskeyT said, not really spoilery. There isn't any new footage until 3/4 of the way through the promo, and what it shows then looks like it could all be from the first ep to come back. Maybe the first two.
With the exception of the footage with Giancarlo Esposito and JD Pardo (Captain Neville and his son), all of this was shown as "Coming Soon" at the end of the last episode. REVOLUTION is starting to grow on me.
It was one of the only hits of the Fall season and hopefully means more science fiction series to come because while there were a lot of SF series a few years ago, now there's very few. Sci-Fi Channel is starting a new SF series this month so we'll see how that one goes.