Originally posted by luke0622 if Pentax can come up with a DSLR that perform as good as K-x, but the size of Pen-1(2) or GF1(maybe a tiny bit bigger, not by much), with their current DA limited lenses
They can't. The DA Limited lenses require a longer registration distance than lenses designed for mirrorless cameras. No matter how you slice it, the distance from the front of the lens to the back of the camera will have to be just as big as it currently is.
They could potentially shrink other aspects of the camera, but it's not going to get any smaller in that dimension. And given that Samsung has already produced this camera, I really can't see Pentax duplicating that effort.