It varies by the school, I'd say. I know MWU-AZ sent out their second round of acceptances on Jan 2. Third round supposed to go out tomorrow. Judging by the official acceptance thread, many other schools have sent out post-Dec acceptances as well.
I know it's tough, but calling the schools in question might be your best bet. Not only will you get a better answer than we can give you, you will also be showing them you are still interested. Bite the bullet and call!