There could be a new AF sensor in the upcoming Pentax K APS-C DSLR flagship camera – see this post from Mistral75:
“For instance the entrance to the AF sensor is wider than before (it goes closer to the borders), meaning that (i) the coverage of the AF points is wider (it further extends to the left and right) and/or (ii) the central AF points are more sensitive than those of the K-3 / K-3 II / K-1 / K-1 II (the rangefinder base is larger). See the comparison below. The angle of shooting is not exactly the same (it’s higher for the K-3 II) but the outcome is unambiguous.”
Via PentaxForums
