I just wanted to point to an alternative for the the ESP8266-sensor nodes, which already combines Arduino and ESP8266EX (& power supply, if wanted). It should also easily run with all ESP8266 examples shown on this wonderful website.
The so-called "radino Wifi" seems to aim for those of us who don't want to fiddle with wiring up all components every time (Arduino, ESP8266 module, power supply...). And it can save a lot of space, too =)
If anyone has already made experiences with this new type of hardware, please feel free to post it here.