I would prepare to wait until April to know where you stand. I remember checking my email every 15 minutes for 3 months straight to hear back. I finally heard back on April 15th, the last possible day to hear back. So my advice would be to sit back, take a breath, wait patiently, and hope for the best!
Since NASS is a recruiting tool as much as anything else, I think it depends on where you are from. Last year, DS heard before the first of March - but I have a feeling our district is under represented (Central Michigan). I think they want to give the opportunity to potential students who aren't likely to visit the campus otherwise.