"Does anyone have an update on when MHR is supposed to report their earnings for Q4?"
Did you go to their website to check when they reported last year? Don't bother, I'll help you. Last year they reported 4Q YOY on 2/29.
This is what the Nas says for this year:
MHR Earnings Date
Earnings announcement for MHR: Mar 06, 2013
Magnum Hunter Resources Corporation is expected* to report earnings on 03/06/2013. The report will be for the fiscal Quarter ending Dec 2012. According to Zacks Investment Research, based on 13 analysts' forecasts, the consensus EPS forecast for the quarter is $-0.05. The reported EPS for the same quarter last year was $-0.1.