...[Special Prosecutor Patrick] Fitzgerald served attorneys for former Deputy White House Chief of Staff Karl Rove with an indictment charging the embattled White House official with perjury and lying to investigators related to his role in the CIA leak case, and instructed one of the attorneys to tell Rove that he has 24 hours to get his affairs in order, high level sources with direct knowledge of the meeting said Saturday morning.
...Rove told President Bush and Chief of Staff Joshua Bolten, as well as a few other high level administration officials, that he will be indicted in the CIA leak case and will immediately resign his White House job when the special counsel publicly announces the charges against him, according to sources.
UPDATE (5/15): Apparently there's some suspicion that this report may be a fabrication or its sources misleading. See, for instance, here. Nevertheless, we should know soon enough.