first of all hi! my name is Koen (koelie) i'm tinkering with the ESP-8266 modules. i have a friend in china so i can buy the chips directly from taobao and the AI-thinker store.
when browsing that one today i found a few new boards:
it now has 22 pins and the following extra pins:
if you look at the fourth picture you see that GPIO9 & GPIO10 are only available in the D version. (cant find that one)
Completely new design
dont know a thing about this version, it looks like the ESP-13 module. written special client only.