I'm sorry to break it to you, but no they did not. An email was sent saying they were considering adding between 1-3 additional days, but nothing has been confirmed. In the same email students were asked not to share this incomplete data to premed platforms such as this, which hotgirlpremed unfortunately did.
There are many reasons why schools ask people not to share information until they do, and ignoring those requests leads to false hope, incomplete information, and anger during an already incredibly frustrating time. I am sorry for those of you who got your hopes up, and I do hope MCW provides 1+ additional interview days for you. However, the school only has a certain number of spots and only a certain number of trained interviewers able to make additional days happen.