I forgot to change the time frame on the VIX chart to 5 days.
Yhoo has very low volatility this week compared to S&P so I wouldn't expect a large PPS fluctuation based on volatility.
If earnings for YHOO are higher on the 28th you may get a small climb in PPS but not major since everyone is already expecting higher earnings for YHOO already and it hasn't boosted PPS this week.
Last several days of 300+pt drop in Dow is due to lower earnings expected on major plays like IBM.