Archaeology has not been canceled (yet?), but they also have not implemented it into the beta. I imagine it will be one of the last things implemented. The zones need to be finished before they can populate them with neato artifacts for archaeologists.
"Do you know if the worgen and the goblin factions are getting representatives at the Argent Tournament?"
They are not.
"Does anyone know who or what the skull in Pit of Saron belongs to? The one that's suspended over the big, open pit?"
I assume it was built and not ripped out of a corpse. We simply haven't seen anything that could have possibly used a skull like that. That doesn't mean such a thing doesn't exist, of course, but I find it far more likely it was built by the Scourge to be an intimidating fixture to keep the slaves in line. That thing watching you work would scare you a hell of a lot more than a glorified Eye of Kilrogg.
"Has Lord Darius Crowley made a return anywhere after the worgen starting zone?"
Yes, but you won't get to see it if you're a worgen player -- or even Alliance, for that matter. Blizzard made a very strange choice regarding the worgen storyline. The story that worgen experience in their starting zone doesn't hit a resolution at the end of it. The story leads into Silverpine Forest, which has no Alliance presence whatsoever. Forsaken players get to see what happens to Darius Crowley and his merry band, not worgen. It's incredibly disappointing, really. The worgen get shunted off to Kalimdor to do quests for the elves instead of getting to witness the resolution of their own story.
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