Got my acceptance today at 10:30am PST by email. I think I was a special case since I'm currently living overseas. Looks like everyone else that's been accepted so far got phone calls.
For those still waiting to hear back from Stanford, here is the Class Profile for the Stanford STEP Class of 2014 that I found posted: https://gse-step.stanford.edu/sites/default/files/stepfactsheet1.pdf.