South Sudan opposition parties of the South Sudan Opposition Alliance (SSOA) and other factions have refused to sign the deal over power-sharing disputes at the state level.
Direct peace talks in the Sudanese capital Khartoum between President Kiir and opposition leader Riek Machar, in addition to representatives of other South Sudan's opposition groups, were hosted under patronage of Sudanese President Omar al-Bashir.
South Sudan's almost five year conflict began after Kiir accused his sacked vice president Machar of plotting a coup against him in 2013. "The agreement is in place and we will remain committed. and will implement (it)", he said.
Once a final peace deal is signed, the foes will have three months to form a transitional government under the new format, which will then hold power for a further 36 months.
Salva Kiir says the new deal will survive because it won't be forced upon them like previous accords.
Under the agreement, the transitional cabinet would be composed of 35 ministers, including 20 ministers from the government, and nine from the Machar-led Sudan People's Liberation Movement-in-Opposition (SPLM-IO).More news: The exact moment when Venezuelan President Nicolas Maduro was attacked by drones
The parliament will be comprised of 550 lawmakers, including 332 from Kiir's group and 128 from Machar's faction.
The rival groups have already agreed on a permanent ceasefire and withdrawing of their forces from civilian areas.
"Last month the White House warned that "a narrow agreement between elites" would not solve the problems plaguing South Sudan".
"I need to get for them their transport, and one person needs a motorcade of maybe five vehicles".
Negotiations for the peace deal had been completed and any outstanding issues with his opponents would be settled after signing of the deal, Kiir said. "So there are so many things need to be done". The conflict between the two rivals is aggravated by tribal divisions: President Kiir belongs to the dominant Dinka tribe, and Machar is an ethnic Nuer.
Sudan's president Omar al-Bashir said on Sunday oil would be pumped from South Sudan's Wahda region to Sudan beginning September 1.