It is not clear if the NPA's sudden decision was prompted by Zuma's public comments on the alleged poison plot. Zuma claimed he was targeted because South Africa had joined Brics under his leadership.
Addressing an ANC gathering in Pongola, KwaZulu-Natal, last Sunday, Zuma said: "I was poisoned by witches who were trying to finish me off in broad daylight. If I didn't have friends overseas, today you would be saying there was a man from Nkandla but he died."
The delays have angered MaNtuli, and Zuma's estranged fourth wife is considering going to court. "My client is frustrated about the delay in the investigation and she was considering her options pertaining to approaching the High Court of South Africa for a declaratory order directing the NPA to make a decision on whether they are proceeding with a prosecution or not," Roux said.
In October last year, Abrahams told MaNtuli she was a suspect in an alleged plot to kill her husband, but there were no further developments until this week.
Zuma's alleged poisoning apparently took place in June 2014. It was reportedly picked up during his trip to the US in August 2014.
NPA spokesman Luvuyo Mfaku said the head of the Priority Crimes Litigation Unit had received the docket.