Thousands of aboriginals marched on Parliament Hill Friday Dec 21, 2012 in Ottawa, ON to demand a meeting with Prime Minister Harper.(ANDRE FORGET/QMI AGENCY)

With literally hours to go until the big meeting Friday between Prime Minister Stephen Harper and First Nations leaders, a raft of details on both sides remain unsettled or unknown.

The Assembly of First Nations abruptly cancelled a press conference planned for Wednesday afternoon during which National Chief Shawn Atleo was to outline his goals and objectives for the meeting.

Protesting Attawapiskat Chief Theresa Spence initially said she would go to the meeting but then changed her mind after learning Gov. Gen. David Johnston won't be there.

Meanwhile, the Prime Minister's Office has so far refused to provide details about the level of his participation at Friday's meeting.