While there is no real precedent in the WH world, it might be an opportunity to allow the PC to try and crawl his way out of the pit into which he's just found himself. For example - somewhere in the mountains is a truly blessed priest of Shallya. The priest is old or her health is failing, but she holds the only hope of removing enough corruption for the PC to be just shy of receiving a mark. Of course Nurgle would be involved - both trying to hinder the PCs, but also trying to kill the priest. Add in plenty of opportunity to fall even futher...wih the threat that there is a point of no return and that there will be no hope at all for the PC if they fall too far. While doing this might be a cheat in some people's eyes, if you and your players are having fun with their PCs, and it won't hurt your overall campaign, I don't see why it couldn't be allowed - once. Removing that much corruption takes a lot out of a dying priest,a fter all. Plus, afterwards, you still have other quests to remove the rest of the corruption......

Instead of waiting for FFG to put out new adventures, why not start a thread offering the homegrown adventures that folks have come up with on their own? Granted, you couldn't type in or add 40 pages worth of notes, descriptions and maps, but you could put down major plot points and ideas surrounding them. It could help out folks with little to no time to come up with their own adventures.