As coy as the power that be have been so far, I'm gambling that the trailer won't really spoil anything for me.
Rumor has it there will be mass screenings at 7PM the night before. I'm gonna have the two main theaters near me loaded and ready in case one has that.

And a third thought: the poster strikes me as very photoshopy. I wonder if perhaps they painted the elements and composited them digitally. I'm not a graphic artist by any means, so I'm just wondering. I have been avoiding spoilers, but I am very curious why Luke is missing from it!