I'm avoiding the spoiler thread, but I don't think the new trailer has any new surprises that people wouldn't know if they've seen the leaked concept art several months ago. So I'll just give my first impression.

First, JJ plays it safe, with numerous nods to the original trilogy. Those are appreciated, but what's really exciting for is the new ship and armor designs in action. Digging the more aggressive Empire and the general sense of a lived in yet not excessively cluttered universe. The atmosphere is good, the style is good, but of course these are things that we know JJ can do well. The big question is not whether he can set the scene, but whether he can tell a story that rises above mere fan service and nostalgia for the past.