Hi!
I can only speak for the PhDs (although I'm pretty sure it applies to MA/MS candidates as well): short-listed candidates were contacted at the end of January. Unofficial decisions went out two weeks later, and official admissions came out last week. I'm not sure what it means if you haven't heard back.. it might be that you're waitlisted for the dual MPP/MA, or that the decisions really haven't been put out yet. I'm not sure. The prospective students' weekend for the entire UCB graduate school is coming up really soon, though.