This probably means he will have nothing meaningful to add to what the White House has already said. It is doubtful he would testify in order to contradict anybody.

Fox News:

Former CIA Director David Petraeus has agreed to testify about the Libya terror attack before the House and Senate intelligence committees, Fox News has learned. 

Petraeus had originally been scheduled to testify this Thursday on the burgeoning controversy over the deadly Sept. 11 attack. That appearance was scuttled, though, after the director abruptly resigned over an extramarital affair. 

The resignation has since expanded into a sprawling scandal that now includes allegations that Gen. John Allen, the top U.S. commander in Afghanistan, exchanged "inappropriate" and sexually charged emails with Jill Kelley, a Florida socialite linked to the Petraeus case. The rapid developments in the case have all but obscured what until last week was an intense debate on Capitol Hill and beyond over the Benghazi terror attack. 

After Petraeus' resignation, lawmakers complained that the scandal was no reason they shouldn't hear from the man at the helm of the CIA when CIA operatives came under attack alongside State Department employees in Benghazi last month. 

The logistics of Petraeus' appearance are still being worked out. But a source close to Petraeus said the former four-star general has contacted the CIA, as well as committees in both the House and Senate, to offer his testimony as the former CIA director. 

Fox News has learned he is expected to speak off-site to the Senate Intelligence Committee on Friday about his Libya report.

The House side is still being worked out. 

If the White House suspected Petreaus would testify to anything that would counter their narrative, they could easily block his appearances before Congress. Since they are apparently allowing him to go forward, it looks like the former CIA director won't add much to the timeline he has already signed off on.

It appears both hearings will be held behind closed doors so the public will not be privy to the dialogue between the general and the congressmen. But since Petreaus has publicly stood behind the administration version of events in Benghazi, it is unlikely he will change his tune - even amidst the scandal that cost him his job.