I know of at least one other time where preferred stock is mentioned in Risk Factors

We May Issue Preferred Stock, And The Terms Of Such Preferred Stock May Reduce The Value Of Our Common Stock.

We are authorized to issue up to a total of 5,000,000 shares of preferred stock in one or more series. Our Board of Directors may determine whether to issue shares of preferred stock without further action by holders of our Common Stock. If we issue shares of preferred stock, it could affect the rights or reduce the value of our Common Stock. In particular, specific rights granted to future holders of preferred stock could be used to restrict our ability to merge with or sell our assets to a third party. These terms may include voting rights, preferences as to dividends and liquidation, conversion and redemption rights, and sinking fund provisions. If we seek capital for our business, such capital may be raised through the issuance of preferred stock.

See Item 1A Risk Factors10KFiled August 23, 2014