The Ministry of Interior recently completed another draft of the law after it rejected the first version under international criticism.
Nuon Chea has used his opportunities before the court to defend the policies of the regime.
Court officials and monitors say the delay is likely to impact the ongoing investigations of two contentious cases at the court.
Foreign Minister Hor Namhong told reporters that Cambodia would work toward regional integration in 2015.
Kim died of a heart attack, and while it appears Kim Jong-un will succeed him, there are questions over an internal political crisis.
Civil society leaders have said they would need at least a month to properly review the law.
Cambodia maintains friendly relations with the reclusive nation, which were forged by the former king, Norodom Sihanouk.
Nuon Chea, Pol Pot’s former lieutenant, told the court that Norodom Sihanouk had visited members of the Khmer Rouge for a week in 1973.
Thousands of pagodas were destroyed, along with the banking and education systems, after the regime came to power in 1975.
The first version was sent back to them from the Council of Minsters, following widespread criticism from the international community.
The new discoveries add to the almost 1,400 new species identified in the same region from 1997 to 2009.
Pung Chhiv Kek, founder of the rights group Licadho, said Cambodia was now sliding backwards in its adherence to human rights norms.