well if you could get offers from these two schools, then I guess you are a very strong applicant. To be honest, I think you have already known pretty much about what you wanna do and which one would be better for your future.
For Berkeley IEOR, they post admission firstly, and then discuss about how to assign the funding (this is what I heard from some PHD candidates there.)
I think they would post all the results excluding those candidates on waitinglist at one time... anyway, congrats to those who made it, and bless everyone.
Where did you find that post ? I only found (and maybe this is a fiction):
Massachusetts Institute Of Technology (MIT)Mathematics, Operations Research, PhD (F11)Accepted via E-mail on 3 Feb 2011A3 Feb 2011 Accepted for math and rejected for operations research. What a joke!