I hope we get to see at least a little bit of smartassery from Han Solo. In the trailer, he just sounds old and sad (I'm probably assuming too much from ten seconds of dialogue). I get that it's been over 30 years, but you can't deny a fundamental aspect of a character such as him.
Surely Abrams and Kasdan will throw in at a least a couple of scenes of Solo being witty or sarcastic. If not, Kasdan has forgotten how to write the characters he defined years ago.
Seeing Han use his gun lethally on a couple of bad guys would be nice too.