Google also says it will continue to provide metrics on mobile vs. desktop prices, as well as additional information on which website links, click-to-call buttons, and other ad features are working best.
The Flex tracks your sleep quality as well, but the approach here differs from other Fitbit products: whereas the Fitbit One and Fitbit Zip have a key you can press to enter sleep mode, the Flex has no buttons at all, so your only recourse for logging sleep is to use the app or website.