There is an exclusive mission in this week's White Dwarf, and there are images out now for it. Its called "At Any Price".
via Gametrust
http://www.gamestrust.de/news%2chorus-heresy-betrayal-at-calth-bilder-exklusive-white-dwarf-mission%2cid47087.html
You need two versions of Betrayal at Calth in order to play this mission.
