Hate to be the spoiler on this one, but it looks like they attempted a "turning (also called "rolling") takeoff" while entering 22L and lost control. The aircraft left some heinous skid marks just past the 22L numbers (indicating rubber was meeting runway and not sliding on ice) diagonally going off the runway with the nose and left main gear.

From what I've heard, it appears that they entered 22L at a fairly high speed with thrust up before lining up on the runway, hit an icy patch that was at the entrance to the runway and they were unable to align the aircraft during this "rolling takeoff". They then slammed on the brakes as the aircraft was heading off the left side of the runway (again, NOT swerving skid marks but at a straight 45 degree angle) leaving the grossly apparant (for many months to come) skidmarks.

The speed was low anough for the antiskid to be inhibited (thus producing the skidmarks), but had to be high enough prior to that the have the speed to make the skid marks in the first place. They are at least a hundred feet long right at the beginning of the runway and there is no curve to them. They go straight 45 degrees into the snow almost touching the 22L numbers.

Unfortunately, I think THIS incident will be a reminder to us all to both slow down on slippery surfaces and not attempt rolling takeoffs when not aligned with the runway.