The following sources are cited in SAP Digital Futures Issue 27: Sensors: Tiny Engines of the Digital Revolution

Sensors will shrink to 50 micrometers (half the size of a human red blood cell).
Ron Milo and Rob Phillips, “How Big Is a Human Cell?” Cell Biology by the Numbers, retrieved August 29, 2017,

Sensors will harvest energy from external sources, such as vibrations or electromagnetic radiation.
Internet of Things: Wireless Sensor Networks (International Electrotechnical Commission, 2014),

Sensors will super-power our senses and create new ones, such as ESP.
Matthew Hutson, “Beyond the Five Senses,” The Atlantic, July–August 2017,

Sensors in autonomous vehicles will generate 1 GB of data per second.
Technology and Computing Requirements for Self-Driving Cars (Intel, May 18, 2016),