The newest is Catherine Abell (philosophy of art), who was previously Reader in Philosophy at the University of Manchester.  The two older ones, which I had missed, were Alice Crary (ethics, feminist philosophy) who is taking up a half-time post at Oxford, but will also continue half-time at the New School in New York City; and Joel David Hamkins (logic), who was previously at the College of Staten Island and the City University of New York Graduate Center.  All three are professors as well as tutorial fellows at various Oxford colleges.

(Thanks to Eric Sheng for alerting me to these moves.)