If I were a betting man, I would be shocked if there were any political statements. It will be a pedal-to-the metal, high energy performance. with encore type of material from a regular concert. I don't know whether he should kick it off with "Born to Run" or end the show with it.

"American Land" has a rowdy, Irish-folk song type of feel to it. He has played it in the encores for the past two tours. The lyrics are flashed on the big screens so that everyone could sing along. I think the song is a strong possibility. Click this to see what I mean. This version was without the E Street Band but still very good: American Land live from Dublin

Speaking of memorable halftime shows, Klydon, SI.com has this collage on its website:
Top 10 Most Memorable Halftime Performances