"Are there any new hairstyles in Cata?"
None that we've seen yet. It's possible that more will be added later on, once the more vital art assets for the expansion are complete.
"How does rep with the two new home-factions work? I mean, if someone wanted to farm their rep to get their mount, are we looking at a billion runecloth turn-ins, or do they have quests about? Since we can't go back and do their starting area quests, I mean..."
We're honestly not sure yet. There are quests that give Gilneas rep for Alliance and Bilgewater Cartle rep for Horde, but any cloth turn-in NPCs aren't yet implemented, if they're being implemented.
I'll worry a little more about it once we've actually seen the mounts the new races will have available.
"Will Zul'Gurub be affected by Cataclysm? I've been farming for the mounts week after week for over a year and hope to continue farming them after Cataclysm if I haven't gotten them yet by then."
At press time, Zul'Gurub is still available as an instance in the beta, though the real estate is also used as a quest hub while leveling through Northern Stranglethorn.
"A question that I haven't really seen answered anywhere, though I might just not be looking hard enough: Are Gnomes and Trolls only getting their own starting zones, and still sharing their respective portions of Ironforge and Orgrimmar? Or are they actually getting a new capital? The way Vol'jin talks to Garrosh, it would be weird for him to go back to the Isles only to hang out there for the starter zone quests, and I don't see why Mekkatorque would decide to stay in Ironforge when they've just started recapturing their city. Mostly I just want to run around a Gnome city that is actually somewhat planned well. Though, knowing Gnomes..."
Vol'Jin now hangs out on the Echo Isles, and Mekkatorque can be found at Gnomeregan's surface, planning further reclamation of the city below.
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