Markus Hirsch is working on a ESP8266 weather display using an AVR mcu and an OLED display:
This is a little weather monitor. It has a 2.2″ color display and is powered by an AVR and the ESP8266. The AVR controles the display. The ESP has a custom firmware written in the Arduino IDE and provides all the weather data in a neat and very simple pre-parsed protocol. The AVR can obtain different data via a simple UART command. It is still in development. A 512kB serial SPI flash provides all the icons, images and palette data.
ESP8266 weather display – work in progress – [Link]