The Washington Post reports that a significant number of witnesses in the Michael Brown case are offering testimony that supports Officer Wilson’s story:

Ferguson, Mo., police officer Darren Wilson and Michael Brown fought for control of the officer’s gun, and Wilson fatally shot the unarmed teenager after he moved toward the officer as they faced off in the street, according to interviews, news accounts and the full report of the St. Louis County autopsy of Brown’s body.
Because Wilson is white and Brown was black, the case has ignited intense debate over how police interact with African American men. But more than a half-dozen unnamed black witnesses have provided testimony to a St. Louis County grand jury that largely supports Wilson’s account of events of Aug. 9, according to several people familiar with the investigation who spoke with The Washington Post.
Some of the physical evidence — including blood spatter analysis, shell casings and ballistics tests — also supports Wilson’s account of the shooting, The Post’s sources said, which casts Brown as an aggressor who threatened the officer’s life. The sources spoke on the condition of anonymity because they are prohibited from publicly discussing the case.

Earlier in the week, the New York Times noted that:

The police officer who fatally shot Michael Brown in Ferguson, Mo., two months ago has told investigators that he was pinned in his vehicle and in fear for his life as he struggled over his gun with Mr. Brown, according to government officials briefed on the federal civil rights investigation into the matter.
The officer, Darren Wilson, has told the authorities that during the scuffle, Mr. Brown reached for the gun. It was fired twice in the car, according to forensics tests performed by the Federal Bureau of Investigation. The first bullet struck Mr. Brown in the arm; the second bullet missed.
The forensics tests showed Mr. Brown’s blood on the gun, as well as on the interior door panel and on Officer Wilson’s uniform. Officer Wilson told the authorities that Mr. Brown had punched and scratched him repeatedly, leaving swelling on his face and cuts on his neck.

The combination of these two developments strike me as making an indictment unlikely.