http://www.pentax.jp/japan/support/download/digital/k5_s.html
http://www.pentax.jp/japan/support/download/digital/kr_s.html
http://www.pentax.jp/japan/support/download/digital/645d_s.html
Via http://www.pentax.jp/japan/index.html
(All in Japanese)
It says it is made to support the new O-GPS1 unit. It says nothing about if the new firmware of K-r will relief the consistent tungsten/yellow light Front Focusing issue or not. Whilst I guess it is unlikely as it is not told, especially for Pentax, I shall try it out shortly to see whether there is any improvement for my own wishful thinking.