Benazir Bhutto's husband said in an interview on Saturday that she left instructions about the future of the Pakistan People's Party to be read in the event of her death, which would be made public on Sunday.
Asif Zardari told BBC radio that the couple's son would read out the message from the former prime minister and opposition leader who was assassinated in Pakistan on Thursday.
Zardari also revealed that his wife had made detailed plans for her burial, including changing the location of the plot from his family's ancestral tomb to her family's mausoleum following another recent suicide bomb attack.
"She has left a message for the party and she has left a will, so we shall be doing that tomorrow (Sunday) after the third day (of official mourning,)" he said.
"We have called for a meeting and her will be read out there and the instructions she has left will be read out there."
Asked if he would succeed her as party leader, Zardari said: "It depends on the party and depends on the will."
Bhutto's spokeswoman Sherry Rehman told AFP on Saturday that the PPP will decide whether to take part in January's elections at a central executive committee meeting on Sunday.
Zardari also spoke of his personal sense of loss following the death of his wife, who he said meant "much more than life" to him.
"I have seen many tragedies in my life... but nothing has devastated me more than this has," he said.
"We were always aware of the dangers she faced but somehow we were hoping that we would succeed and they would not -- the terrorists and the people who back these terrorists."