Hi again!
I had a phone call with my potential advisor at UW last week. The purpose of the phone call was to offer an opportunity for me to ask questions, and the conversation was entirely unofficial and did not discuss the status of my application. It sounds like they are making final decisions soon, and then official letters will be sent out in 3-4 weeks. However, my potential advisor said that once final decisions are made, professors are allowed to individually contact applicants to give them unofficial notification of their acceptance.
Congrats on your acceptances! That's awesome! Sorry to hear Cambridge doesn't have any funding for you... It was my understanding that all research-intensive Ph.D. programs offered funding packages, so that's surprising to hear. Washington State is requiring a decision by March 1st?! I thought every program gave until April 15th for applicants to make decisions?
Good luck to you with UW! Hopefully decisions will be made by March 1st!