Meh... That showed hardly anything new.
Are you kidding?? It showed Juliet most likely rediscovering an intact Swan hatch (!), it showed Faraday exploring what could be a Cerberus vent (looking at something that appeared to be a petrified...snake?), it showed him also perhaps meeting the deceased Radinsky...the implications of some of the clips are pretty huge.
I have to say, while it may just be me, I really got a sense of dread watching that that I didn't get in the initial trailer for last year. The color palette seemed to be even bleaker, if you can imagine that, and if the Losties that were on the Island when it was 'moved' are indeed back in the 'past', it sets up the possibility of an ending that's very The Third Policeman.
Seeing the Swan again also confirmed one of my biggest fears: that Desmond will come back to the Island after Ben kills Penny and will somehow end up stuck in the hatch again. Remember, the old British woman in "Flashes Before Your Eyes" said that pushing the button was the greatest thing he'd ever do, and we still don't know exactly what he did to get put in prison and get a dishonorable discharge. Maybe he actually deserves it. That seems contrary to everything we know of him, but this is LOST we're talking about.
Regardless, I really think the light/dark, Heaven/Hell subtext is getting stronger, and it will be interesting to see just how cruel or merciful the creators of the show are to the characters, or at least who ends up where. I'm pretty convinced at this point it's all based on how they're suggesting that Time isn't what we perceive it as, and on the 'other side', its linear nature is exposed as just a limitation of our 'stuck' minds.