I mentioned a few times that this wouldn't be available until Betas ship, but I understand that people want to get started on custom boards so here is some preliminary info (having just sent the Beta boards to the fab) - but please don't count on this not changing.
The Acron module has been reworked to have the same pinout and dimensions as the ESP12 - so it is now a drop in, cloud ready, with more flash replacement (with a pretty different inside design) for those modules. So the dimensions (or close to them) and pinout of say this (
http://l0l.org.uk/wp-content/uploads/2014/12/ESP12pinout.jpg) apply - though not the internal circuit, routing, or anything else.
The Oak itself is about 33mm x 23.5mm and the module overhangs one side a bit - this pin out is still correct EXCEPT for SPI:
https://ksr-ugc.imgix.net/assets/003/647/889/c08864c752651c147ff9f6f1182be2ae_original.png which is now P7 MOSI, P8 MISO, P9 SCK
And for the record I do read every thread on here, but when I'm pressed for time I tend to not answer threads others have answered or I have answered elsewhere until everything else is caught up.