This is from their web site,
"3. Interview Notification
Applications are reviewed from September through April. You will be notified by email when a decision is reached regarding an interview. Invitations to interview are issued throughout the September-to-April interview season at the discretion of the Committee."
Plus it seems like everyone is backed up this year so I wouldn't be surprised if invites still were going out as late as late March. Obviously I'm hopeful, but there is a reason so many of us are left in purgatory (not interviewed, but also not yet rejected).