Two of the people the Saints have interviewed, Kubiak and Griese, are both unable to be hired because the team they currently work for is going to the Super Bowl.
So far the only OC hire that has actually bummed me out is Zac Robinson. He has a lot of potential and is going to the division rival.
They're interviewing Brian Johnson today. If nothing happens today/this week, I'd assume the Saints are waiting until after the Super Bowl.