Definitely don't bank on being accepted to the program yet!
I was in the same position 2 years ago. Was invited out to the school, put up in a hotel, interviewed, toured, and even invited to some swanky gatherings by the department head.
UCI was the only grad-school I applied to. After sending an interest email before graduating from my under grad in 2006 and then taking a year off, UCI called and asked if I was still interested. I was, so I applied and went for the interview. It seemed like I had it. In my first meeting I was informed that I was 1 of 4 finalists. I thought that was pretty good for not having an impressive background. Anyhow, by the time I left the school I felt that I would be receiving an acceptance letter the next month. Instead I was not accepted. Not sure why, but it must have been the right thing. As much as I would like to know why I wasn't accepted, I never bothered to ask - just kept moving on in life.
What did catch me up while I was there on the student led tours, was how they referred to all of their performance spaces. Each space was referrerd to as "crappy". Now I know that most of us want bigger and better, but they seemed to have little to no pride in their performance spaces. It bothered me. Not saying that I wouldn't apply again because the structure of the program does appear to be exactly what I'm looking for; I would hope that their self respect has improved over the past 2 years.
I know I made a short response long. But just be sure it is right for you. UCI showed me both the positive and the negative at the same time. Don't bank on anything, and make sure you see the whole picture before you decide anything.
Since not being accepted into UCI, I have gone on to SM for a new community theatre in Denver and now for a well established community theatre company in Las Vegas. I think all that happened was good, right for me, and happened for a reason.