We have good news and bad news. The good news is, if you hated dealing with zombies and the plague, it's going away in just a few hours. The bad news is, if you loved dealing with zombies and the plague, it's going away in just a few hours. Tigole confirmed it in a thread on the General forums, and also mentions that this isn't all that they have planned for the pre-Wrath umm... festivities, I guess?
He doesn't go into specifics about what will be happening next, but the plague is going away. The special bosses and the necropoli wil be around for awhile yet, a week for the former, a few days for the latter, but the zombies will be no more as of noon PST. Tigole also assures us that this had nothing to do with the whining. This part of the story had simply run its course. We have no idea what's next, but whatever it is, I can't wait to see it.