The tribunal has experienced cash-flow problems this year, with some donors reluctant to fund the court.
The appointment is expected to go to Rong Chhorng, who is currently the acting head of the unit.
Today this Buddhist temple is tranquil, but when the Khmer Rouge ruled Cambodia between 1975 and 1979, it was anything but.
They will determine which complainants can participate in Case 002 when it goes to trial as early as next year.
JCE considers members of an organized groups and makes them individually responsible for crimes committed or planned by the group.
Besides bringing senior leaders to trial, the tribunal was also meant to bring a measure of reconciliation to the country.