Medium Roast

I applied to all top schools and have been rejected by all of them except one...I got an interview at another good school, and I am waiting to hear back from them on a decision. I contacted the last top school, and this graduate program office wrote back to me stating 'all decisions will be made by 4/15.' I figured if they wanted to reject me already they would have like all the other top schools, but they have not. Now I am stuck here wondering and waiting.