From what I understand, people do not move off the Tuck wait list. I learned during my interview with a current student that Tuck has over admitted in the last few years, and as a result people admitted to the T '11 class were offered scholarships to be in T '12 because Tuck is very adment about the 250 person class size. Consequently, the T '12 class already had confirmed members before their application cycle began.
I am still hoping for that 4:30PM EST call, it is 3:18PM now....