Originally posted by ogunturkay Here is the 560mm prototype version from CP+ 2012 and it's quite similar into folded position.
Is that really a difference, though? The knob is just in a different position. And the bottom handle is different colour, as well (black, like in the prototype photos, unlike the beige of the actual finished product).
I think this is just a preproduction prototype that they use as a prop. And because of this it doesn't look exactly the same. It might not even be functional (maybe a knob fell off during its time as a prop and was placed back on haphazardly)
I wouldn't take it as any big indicator, though I guess i would be nice of Pentax to make a "compact" 400mm. I wouldn't hold my breath waiting for it, though.