If that proves to be true, it would seem to me to more or less eliminate the likelihood of Officer Wilson being charged (unless, and it doesn't sound like this is the case, all of the third-party witness information was damning to Wilson and accounted for his injury).
I find it frustrating that this case has become such a major national item, and that this "protesting" has continued and actually gotten worse over time. This is nothing but the media and black "leaders" like Al Sharpton getting people whipped up. In that sense they are no better than the opportunistic, anti-social assholes looting and throwing frozen water bottles at the police. I am actually glad the Chief of Police released the video of the robbery, as that took the wind out of the sails of the media's effort to paint this as a placid, innocent black teen being murdered in the street in broad daylight.
I still want to see the evidence before drawing any firm conclusions, but preliminarily this looks to me like a justified shooting or, at the very worst, an officer who got carried away under an intensely stressful situation (i.e., manslaughter). It certainly doesn't look like a murder.