Market preview: S&P futures plummet 1.6% after nonfarm payrolls come in unchanged in August. Treasury yields sink to near record lows. Precious metals shoot higher; crude oil turns lower. Financials are sure to skid on reports the U.S. will sue big banks; BofA -6.8%. With slowdown bears coming strong out of the gate, will stimulus junkies fight back later in the session?