Many people in the media have speculated that there will be no halftime show due to the possibility of snow wreaking havoc on it, but organizers are saying that is NOT true. There will be a halftime show, and there are already some names floating around.
There is speculation about the possibility of going to someone from the NY/NJ area, which has obviously produced many music superstars. Bon Jovi, Alicia Keys, Billy Joel, Jennifer Lopez, and Lady Gaga to name a few. Apparently on the NFL Network, they suggested that U2 is being considered for the show. They would be my choice if I had any say, which I sadly do not.
U2 previously performed at the Super Bowl XXXVI Halftime show in 2002, just a few months after the September 11, 2001 attacks. Many consider it the greatest halftime show of all time. They gave fans both excitement and reflection as a tribute to those who lost their lives, with victims' names rising up to the ceiling of the Superdome as the band went from 'MLK' into 'Where The Streets Have No Name', ending with Bono showing the American flag inside his jacket. They also have another connection with the NFL, performing along with Green Day to re-open the Superdome the year after Hurricane Katrina.
Its still very early, and the list of potential performers is probably large, but it is fun to speculate.