The first picture of the Pentax KP leaked online and the camera looks very much like the Nikon Df. There will be also a new Pentax D-BG7 battery grip andAC adapter K-AC167J. The KP will be available in three different grip sizes (small, medium and large) - see more pictures at PentaxRumors. The rumored price of the Pentax KP in the UK is £1,099 (around $1,350$ or €1,270).
Update - here are the Pentax KP specifications:
Via PentaxRumors, Xitek, Nokishita