The guess is offensive line by ESPN ... and it's offensive tackle Chris Williams.
The Bears more than nine minutes of the 10-minute allowance. That leads me to believe they waffled back and forth on the pick or they were entertaining trades. Running back Rashard Mendenhall still was available and I think the Bears considered taking him to shoulder the rushing load in case Cedric Benson and Adrian Peterson still can't get it done.
Offensive line was the safe pick and fills an important need. The Bears need to protect their quarterback (whoever it will be) just so their offense can get started.