This would contradict the CIA timeline as well as statements from the White House.

Breitbart:

According to this source, Petraeus will tell the closed door congressional hearing that he knew "almost immediately" that the September 11 anniversary attack on our Libyan consulate was a terrorist attack committed by the al-Qaeda-linked militia Ansar Al Sharia.

Frances Townsend, a former Homeland Security advisor to George W. Bush, who is now a CNN analyst, tweeted this out:

CNN:Petraeus wants 2 testify 2 Congrss tht he knew 9/11 #Benghazi attacks were terrorism, perpetratd by Ansar Al Sharia 'almost immediately'

Other than Petraeus's upcoming testimony being "different than what he initially said," Starr's source also reported that Petraeus will tell Congress that at first there were at least 20 different intelligence reports floating around that said the video was responsible for the attack, and that over time, those reports were "slowly disproved."

Petraeus also told this source he believed the CIA talking points given to  Susan Rice came from within the White House or Administration. (emphasis added).

So there's a chance Rice may be only stupid, and not a liar. With most of the intel community telling the foreign policy establishment that Benghazi was a planned act of terror, Rice dutifully made the rounds on the Sunday talk shows armed with what she thought were CIA talking points, but which actually originated in the White House.

This should be a very interesting hearing today. Too bad it will be behind closed doors.