I got the call yesterday and was accepted! Hello future classmates! As others have said above, your ExCom member calls you, then you get the confirmation email 1-2 days later.
During my interview day, they said they evaluate the week of applicants (3 days of interviews roughly) at the end of the week, then call you and let you know if you've been accepted about a week after your interview (I'm so happy I did not have to wait several months to hear back).
As for RECOMMENDATIONS: I'm lucky to have interviewed at several schools before UW, and UW was definitely my hardest interview. Most schools asked me about myself and my application. UW asked me questions in areas about public health, health policy, health care systems, ethical scenarios, etc. The interviewers were so friendly but (not to be paranoid) I'm pretty confident that one question could have been a trick question. So brush up in all these areas and know what's going on in the world of medicine. I highly recommend doing mock interviews, especially with more than one interviewer so you can practice looking at more than one person while talking. The interviews I did with my advisors at my school, who are far more educated than me in healthcare, were so helpful for me.
Good luck everyone!