I haven't heard back either, but since I haven't heard anything so far, I am assuming the worst. I checked the results page for some posts from previous years, and last year they informed the people who were not admitted around this time, the second week of February. On the results page, search for UCSF epidemiology. THere is a long list of rejections from last year.
I did get an email from the admissions coordinator a couple of weeks ago, saying I should hear something by the 2nd of Feb. 02/02 has come and gone, but still nothing.