Amazon (NASDAQ: AMZN) CEO Jeff Bezos excited the company's 100 million Prime members last week by saying they could expect more benefits at Whole Foods in the future.Bezos' comments came in his annual letter to shareholders, sent on April 18. He wrote that the company had started "the technical work" needed to bring more perks to Prime members who shop at Whole Foods. Exciting changes have already rolled out since Amazon scooped up the grocer last June.