Hi guys,
Here are some data that I collected from the past (applicants' self report. Date source: thegradcafe) or was told by the schools.
For UPenn, they usually send out the letters between late February to mid March.
For UChicago, they usually send out the letters in February (acceptance or rejection), but if applicants do not receive the rejection letter or admission letter from the school, it could be that the applicants are on the waitlist, and the decision will be made in April.
For UKansas, applicants will be notified in the late February.
For UMN-Twin Cities, applicants who met the first deadline will be notified in the late January and early February (I was notified by the school several days ago, but still no sure what the financial package will be)
For UNC at Chapel Hill, some applicants have already received the admission for the Fall 2016 in the late January. However, I have not heard anything from the school yet. According to the past, the school sent out the letters in march.
For Boston University, applicants will be notified by the school no later than March 24. Usually, the school sends out the letters in the late February.
Anyway, finger crossed.