I have a 5A with the text printed on the board “version 1.1”. I expected the GPIO pinout as described in the wiki HW 1.1 . But by experiment I found it looks like the pinout is as wiki HW 1.2
So I have HW revision 1.2 despite the text “1.1” printed on the board? Or is there some other explanation?
Oh, it’s simple. 
Wiki has pinouts for X1.1 and X1.2, which are pre-production versions, and your board is V1.1 (not X1.1), so it’s indeed closer to X1.2.
Thank you for answering @GinKage!
When you say “closer to x1.2” I hope you mean “exactly like x1.2”. Or if x1.2 != v1.1: is there a description of the GPIO pinout for “v1.1” boards?
If only it were that simple… So far it seems that Radca themselves don’t have the up-to-date schematics and pinouts.
Oops. Well I’m in the process of connecting a bunch of stuff. So I’ll post here in a few days what I found.
I do have one hint for you though: on v1.1, there is pull up on SCL but NOT on SDA for I2C8.
I found a note about differences between x1.2 and v1.1 here
And I have used about half the GPIO pins now and can confirm that so far it seems in accordance with x1.2 GPIO pinout.