製品名:「smc PENTAX-DA 50mmF1.8」(仮称)製品写真
・「Kマウント」デジタル一眼カメラ専用の標準中望遠単焦点レンズ ※2012年2月15日 誤記を訂正いたしました
・自然なボケ味で、立体的な描写が得られる明るいF1.8の開放F値を採用
・2012年発売予定
Via: http://www.pentaxforums.com/forums/pentax-news-rumors/175724-pentax-full-frame-dream-crushed-today.html
But this time, I have a different opinion than the above OP's. At this moment, it is completely technically correct for the 50mm on APS-C, i.e., the effective focal and Angle of View is in mid-tele. But if some days later there is really a K-mount Pentax FF body, then this 50mm lens could become a "standard" lens again, as long as it has a true 135 Full Frame coverage.
So, there is hope, still! ;-)
Previous Related:-
DA35/2.4 and DA70/2.4 Limited on Film (Large Samples, f/2.8 to f/11)
Compatibility of DA Lenses on Full Frame