My prediction for what we will see in the trailer. Let's call it Star Wars Bingo:
C-3po will say 'Oh my'.
Han will either say 'I've got a bad feeling about this' or there will be the 'I love you' 'I know' line to Leia
Twirling Lightsabers
Key characters will be wearing pretty much the same costumes they did in Jedi.
Chewie will have a family/Son sidekick.
You will see the falcon do a similar twist away empire shot from some attacking destroyer.
Too much Lens flare
R2 will do a bleep and use his jets.
Lets see how many I get right.
Dave