The public voted and decided the names should be "Vulcan" and "Kerberos", but it won't be official until SETI says it is.
Today at 12:00 PM EDT you can jump on a Google Hangout with SETI to hear the official naming of Pluto's two smallest known moons. SETI held a vote a few months ago, and the winning names were "Vulcan" and "Cerberus." Cerberus is already the name of an asteroid, so to avoid any confusion they're expected to use the alternate Greek spelling "Kerberos." We've got the live video right here.