First, we really don't have any inside info on this one. Even the people we talk to often aren't saying anything.
That being said, I think a November release seems likely. I'm thinking Nov. 9, 11 or 16. This will feel like it's coming up relatively "soon."
"Will the Zul'Gurub mounts still be available by other means?"
We don't know yet. However, if you wanted them and haven't gotten around to farming one (or both), I would suggest you start now, just to be safe. If I had to guess, I'd say they're going to be removed -- but that's just a guess. I don't know either way.
I'll also take a minute to say how scared I am about what's going to happen to the price of the turtle polymorph tome ... I could see that going well over 100,000g eventually. If you have one and haven't used it, now would be the time to save it and forget about it until it becomes a super rare item of yet-unknown demand.
Mister Rik asked:
"In the reworking of the Old World, are they getting rid of the existing runners and tightly packed groups of mobs?"
More or less, yes. The running behavior is still exhibited, but you won't find tons of clusters packed together in short range of each other that will lead to chain pulling of large groups. I haven't seen any like that in my travels, and after talking to a few people who have leveled through, they haven't, either.
"So far, what do you think is the coolest, most awesome, mind-breaking thing/person/event that you've seen in Cataclysm?"
"Conversely, what did you expect to be really epic in the beta, but it turned out to not be nearly as cool as you thought?"
The worgen starting zone. When you play the goblin area, and then play the worgen area, the worgen starting zone is underwhelming and not nearly as awesome.
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