Another day, anotherrevelation. According to the CV of DICE staffer Adrian Vershinin, the developer is working on a new IP.
While no exact details are available, Vershinin contributed as story and script writer from October 2011 to February 2012. DICE have been busy providing DLC for Battlefield 3 across the last few months, and it certainly wouldn't be a surprise if a new IP reveal is on the way.
It's worth noting that rumours continue to appear with regards to Mirror's Edge.
EA have declined to comment on the entire situation.