I think that the Sean Bell verdict is not that likely to result in civil unrest (i.e. a race riot). In contrast to L.A. in 1992, there is no nationally televised video of the incident. Furthermore, the Dialo and Louima cases from a few years ago did not result in civil unrest.

But, I do think you'll see a spike in various forms of crime during the coming months, as a result of the poor economy (banking and the Street appear to be circling the drain) and the onset of warm weather.