It's official, of course. See:-
First Posted: http://www.pentax.se/se/news/1274/news.html
(Or the Google Translated Page Here)
http://www.pentax.jp/english/support/digital/k-7_s.html
What's New then?
1. Now supports distortion and CA corrections for the FA Limiteds (31, 43 and 77);
2. Better algorithm for auto horizon correction (? - The English is not so understoodable);
3. Improved compatibility with some SD cards.