Electrochemical sensors in the next generation of mobile devices

It's interesting to look at advertisements in the trade journals aimed at designers of the next generation of mobile devices. A few years ago, the ads were all for MEMS accelerometers. A few years before that, it was GPS modules. The ads I'm seeing now are for electrochemical sensors, very small radars, and spectrometers. What those suggest to me are possible uses around safety, massively crowd-sourced environmental monitoring (with applications both to weather forecasting and WME detection), and most interestingly, personal health monitoring. I expect my phone in a few years will be always listening to my pulse and breathing, sniffing my respiration and sweat, looking for anomalies. Whether that information is reported to me or to someone else is a privacy question of some importance.