It was mentioned on the late news tonight and I found only a couple articles online:

Plane slides off O'Hare runway :: CHICAGO SUN-TIMES :: Metro & Tri-State

The news also mentioned an aircraft returning to ORD due to engine problems. The news on TV mentioned it was UA but this article (also mentioning the above story) says it's AA:

Two Plane Incidents at Chicago's O'Hare Airport

Again, glad everyone made it okay to see their families for the holidays.