Next week, the court will discuss recent medical reports examining the physical abilities of three defendants to stand trial.
Allowing the publication of that submission will further help victims who wish to be a part of the case, tribunal monitors said Monday.
In an exclusive interview in July, Meas Muth told VOA Khmer any accusations against him were not legal under the rules of the court.
Nuon Chea, who is now 85, and Ieng Thirith, 79, will go before the Khmer Rouge Trial Chamber.
In an exclusive, rare interview with VOA Khmer in July, Ta An Ta An denied overseeing major purges during the Khmer Rouge period.
According to prosecutors, Im Chaem took part in leading a purge of the Northwest Zone beginning in June 1977.
Between 500 and 700 Khmer Krom were killed at the site, according to the Documentation Center of Cambodia.
Victims of the regime had complained they cannot properly file as civil parties without knowing which sites are under investigation.
Questions over the handling of cases 003 and 004 have divided the Khmer Rouge tribunal (ECCC).
The court has completed one trial, of Khmer Rouge torture chief Duch, and is preparing for trial of senior leaders.
Rob Hamill's quest for justice is the subject of a new documentary, “Brother Number One”.
The international investigative judge for the court told VOA Khmer he anticipates at least two years of proceedings.