I'd definitely try to nail as much of the material that you can get hold of, so if the call comes, you will be up to speed in almost no time.
Knowing they've got someone in that is right on it will reinforce their decision to get rid. If they feel they've done the right thing, it makes your position even stronger.
If the call never comes, you'll have had fun learning some new lines, it all adds to your "vocabulary".
Get learning now! (if you haven't already started )