The local press have named the two pilots onboard that flight; the PIC was Australian and the co-pilot a Slovakian. There were no passengers onboard as they were carrying drums of diesel to a remote location in West Papua (Irian Jaya).
Not a good day for Susi Air as one of their caravans apparently went off the runway in Kupang this afternoon as well. News report (in Bahasa)
here.