In the meantime, you can see my documentation at http://l0l.org.uk/2014/12/esp8266-modules-hardware-guide-gotta-catch-em-all/
As well as an exercise in documentation, I discovered the new(ish) module ESP-12. And it seems that there are at least three modules that offer the ADC pin - a variant of ESP-07 with 16 pins, ESP-12 and a module called Dooao DWA8 http://item.taobao.com/item.htm?id=40283571127.
I hope this is useful and let me know if you have information to add.
Gareth