On October 29th FCC published five additional documents regarding the upcoming Pentax K-3 Mark III DSLR camera. Two of them are of particular interest:
There are 41 squares with a lighter border (selectable AF points?) and 60 plain grey squares ( non-selectable/assistance AF points?). The AF points arrangement would therefore be as follows in the viewfinder:
Which are the 25 cross-type AF sensors remains to be determined. It might be the 5×5 grey squares of the central section in the diagram above.
Thanks Mistral75!