Rove "unsure" whether he will be indicted

From today's Washington Post:

White House Deputy Chief of Staff Karl Rove sought to convince a federal grand jury yesterday that he did not provide false statements in the CIA leak case, testifying for more than three hours before leaving a federal courthouse unsure whether he would be indicted, according to a source close to the presidential aide.

In his fifth appearance before the grand jury, Rove spent considerable time arguing that it would have been foolish for him to knowingly mislead investigators about his role in the disclosure of the identity of undercover CIA officer Valerie Plame to the media, the source said. His grand jury appearance, which was kept secret even from Rove's closest White House colleagues until shortly before he went to court yesterday, suggests that prosecutor Patrick J. Fitzgerald remains keenly interested in Rove's role in the case.

This doesn't have the earmarks of just tieing up loose strings, as the testimony was described by Rove's buddies yesterday. Three hours of gruelling testimony? Unsure of indictment? Loose strings?