Actually, SNY never disclosed the submission date of Aubagio's US NDA, so we don't know for sure that the PDUFA date was in June.
Rather, SNY announced on 10/20/11 that the Aubagio NDA was accepted for review (#msg-68164569) It's barely possible that the NDA submission was made as late as mid Sep 2011, in which case the PDUFA date would be in mid July.
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”