No, it hasn’t happened yet, but we have a start.
Yes, I know, it still has to go through the National Archives, where it will take years* to catalogue then and screen for classified material:
Computer technicians have found 22 million missing White House e-mails from the administration of President George W. Bush, according to two groups that are settling lawsuits they filed over the failure by the Bush White House to install an electronic record keeping system.
The two groups made the announcement as they settled lawsuits that they filed against the Executive Office of the President in 2007.
But the public might not see any of the e-mails for quite some time because they will now go through the National Archives normal process for releasing presidential and agency records.
Of course, even if major revelations are present, that Barack Obama and Eric Holder will their do their level best to ensure that the rule of law is not enforced.
*My guess is that this will be finished a little bit after the 2012 elections.