ESP8285 is a cousin of ESP8266 WiSoC, but allows for smaller designs.

ESP8285 is a cousin of ESP8266 WiSoC, but allows for smaller designs. That $2 module is just 1.4 x 1.3 cm in size.
http://www.cnx-software.com/2016/07/15/psf-a85-is-a-2-esp8285-wifi-board-for-iot-and-wearables