I just saw this EDIT: plagiarized piece of work by Asmodan. Essentially, he figured out that the active drakes on Halfus are not random; they follow a set pattern that changes every week, and we’ve now seen them enough weeks to deduce the pattern and know (or have a pretty good guess) which drakes will be active ahead of time. If the theory is correct, US this week should have Slate, Time, Whelps, and EU/KR/TW should have Slate, Time, Nether.
Great stuff, though credit should go to Simca on the mmoc forum, not this tard. My bad. (And those of you on heroic Halfus, yes, I know you know which ones. :P)