You know, I don't think it's wrong to expect some kind of acknowledgement--a "Hey, you got the job!" or a "Welcome to the Program--look forward to meeting you (again) in June". We've vested a lot of expectation in this whole applicationinterviewrankingmatching thing--I know that I wanted to get right on email and say hello.
Now some programs may turf this to coordinators who aren't as invested, or who maybe have other stuff on their plates, and treat it as a more routine thing. But this is different than the routine. It's kind of the highlight of the year, the culmination of what we've been spending the last 6 months working on.
Just my feelings about it anyhow...