I haven't contacted the department, mostly because, for me, if it's bad news, I don't want to hear it from a person. If it's good news, hooray, but at the same time, if it's good news, I'd rather have something in hand (an email or a letter) to show people so they don't think I'm just screwing with them (which, in my family, isn't outside the realm of possibility).
I'd wait it out for a bit longer. It's still early in the decision making process.