I had this in the "excited VF explained" thread, but think I'll post it here. More down to earth discussion
Also, I attach the drawing here again, taken from the other thread mentioned above.
So, I have a question, too.
Is the VF LED status line a mini board sitting at one side of the focussing ground plate? And if so, why isn't is part of the drawing? Same goes for AF overlay points.
As long as we don't see (in the schema drawing) how the VF LED status display and the AF overlay points are implemented, the drawing may just mean that we see the K-7 implementation of a plain optical VF like the one in the K20D.
From what I've read here, the patent mentioned by RuiC would require more than a plain focussing ground plate. But there is nothing else in this drawing.
So, for the time being, I consider the evidences for an electronic viewfinder overlay in the K-7 to be non conclusive.