Hey AL2013,
I have only heard from Cornell (yes, by email on 2/11) and Duke (No, 2/11). I am still waiting for Chicago, WWS, GSPP, Ford, MIT, and HKS (which presumably is a rejection given that 2 people have already noted acceptances in the result section).
With respect to the Ford School, I think that decisions are released at different times depending on which specialization you have picked. I applied for the Policy/Econ program, and judging from last years results, those decisions come out much later than the Policy/Sociology ones. And even for these different programs, it doesn't look like the school sends out all decisions at the same time.