Well if you like spoilers... here goes...
I found this website a long time ago and they just released what looks like a sort of plot summary for the main characters I think... Looks like Levitt's going to be in it...
http://batman-news.com/2011/03/02/possible-plot-summary-for-the-dark-knight-rises/ (http://batman-news.com/2011/03/02/possible-plot-summary-for-the-dark-knight-rises/)
There's also talk of a new ride for Batman. Likely his aerial vehicle that we saw in Batman Arkham Asylum. It was when it dropped off the hanger attachment so he could prop it between two walls and slide across.
http://batman-news.com/2011/03/03/batmans-new-rides-in-the-dark-knight-rises/ (http://batman-news.com/2011/03/03/batmans-new-rides-in-the-dark-knight-rises/)