Originally posted by mtkeller It has the joystick for controlling the AF point, so that's why they needed a new one. I think (but am not sure) it also has the same new shutter button that the body has. . .
there is a size difference too between the K 3 III and the K 3 II I just discovered
Compare camera dimensions side by side
Pentax K-3 III is 2% (3 mm) wider and 1% (1 mm) taller than Pentax K-3 II.
Pentax K-3 III is 5% (4 mm) thinner than Pentax K-3 II.
Pentax K-3 III [820 g] weights 4% (35 grams) more than Pentax K-3 II [785 g] (*inc. batteries and memory card).
Pentax K-3 III dimensions: 134.5x103.5x73.5 mm (camera body only, excluding protrusion)
Pentax K-3 II dimensions: 131.5x102.5x77.5 mm (camera body only, excluding protrusion)