From the Wall Street Journal (sub. req.):

Justice Department lawyers have filed a grand-jury referral stemming from the 2006 U.S. attorneys scandal, according to people familiar with the probe, a move indicating that the yearlong investigation may be entering a new phase.

The grand-jury referral, the first time the probe has moved beyond the investigative phase, relates to allegations of political meddling in the Justice Department's civil-rights division, these people say. Specifically, it focuses on possible perjury by Bradley Schlozman, who served a year as interim U.S. attorney in Kansas City, Mo.
...
It wasn't clear which of Mr. Schlozman's comments prosecutors are focusing on. He has declined to be interviewed by investigators since leaving the department. One possibility focuses on Mr. Schlozman's 2007 testimony to Congress, one part of which he later retracted.

You can watch the Schlozman testimony in question here and read his "clarification" of his testimony here.