I've just played a session of 'Chaos in the Old World' - the FFG board game.
Good game, hands down, seriously!
I'm amazed how well they've managed to capture the character of the different Chaos gods in rules. Even though I only played a small 2-man game with a friend of mine (and a wfrp enthusiast), it was already a very tight and interwoven game. I played Nurgle and I happily brought pestilence and disease to the populous areas of the Old World, but Tzeentch, Changer of the Ways, very cunningly managed to undermine my attempts and subvert my efforts.
Luckily Khorne didn't join the game or my feeble and frail cultists would have been mincemeat. And I needed those weaklings to spread my plagues.
Oh and curse those Bretonnian Knights for wiping out my sickly forces. Serves them right that Bretonnia ended up as a ruined chaos waste, a pustulent, blighted sore, quite in the image of the diseased gardens of grandfather Nurgle. Hah!
Really, I can recommend that game. With 4 players (even 5 with the Horned Rat expansion) it must be bloody mayhem. Fast-paced and full of mean player-player interaction. The game even has a horror-scenario ending: that all rounds are used up and that the Old World manages to escape the all-consuming ravages of Chaos for another year!
Have you guys tried it?