Ulduar and Blizzard's "hard modes"

We're only a day into 2009, and we've already got an update on one of our predictions. Vaneras has appeared on the EU forums talking about Ulduar's difficulty level and he says that yes, it will make a PTR appearance, and yes, it will be hard, but probably not in the way that we'd expect. He says that Blizzard is pleased with the way the "Sartharion with no drakes" worked, so they're planning to