1. @ DPR (Full Size Available):-
http://www.dpreview.com/galleries/reviewsamples/albums/pentax-k-50-preview-samples
2. @ Pop Photo (Full Size *Original*):-
http://www.popphoto.com/gallery/sample-images-pentax-k50-k500-dslrs-and-q7-ilc
Well, it seems that Popphoto and DPR went to the same press conference and shot the same targets.. Nevertheless, the Pop Photo samples indicate that the Firmware of the K-50 camera is in Version 1.0.
3. @ Pentax Japan (Small Size):-
http://www.pentax.jp/japan/products/k-50/gallery/index.html
Go inspect if you're interested. But my bet is that those samples will give you no excitement and surprise of any, as the same sensor and image processor have been used over and over again for long by Pentax. So, for most of us, we actually knew that what would happen! >:-(