Here's what Schwab has to say about the earnings announcement:
"EXC has confirmed that earnings will be announced 02/07/2013. With 16 analysts covering EXC, the consensus EPS estimate is $0.64, and the high and low estimates are $0.78 and $0.57, respectively."
I think also that with all the call buying and large share purchases going on that the divi will be around $1.50. With a 4.3% yield that makes the stock worth around $34.88. This must be why there is so many calls being bought at the $30, $31 and $32 strike price for Feb. and March.