With the S&P 500 near record highs this gives me the idea that "VIX" ETFs like the VXX or VXZ might be something to watch ahead and after the FED related speech by Janet Yellen later this week. Here is an overview of "VIX" "ETF" products: http://www.firstbridgedata.com/page/list-of-vix-based-etfs/
Understanding "VIX" ETFs
And finally here is the screenshot showing the current very very low of the S&P 500 , which could be a sign that a trend change might occur soon. In case of a sharp decline this could mean a rising VIX index.