Fantasy Flight Games has released Daemon Hunter, a supplement for Dark Heresy. Amongst other things, the expansion allows the creation of Grey Knight player characters. I guess all the Dark Heresy players were jealous of all of the Deathwatch players. Now the other arm of the Inquisition has it's marines!
I have been rather looking forward to this, I'll let you know what I think as soon as I get my grubby little mitts on it.