In lieu of providing any new information on Cataclysm in the wake of BlizzCon, Blizzard's been showing the goblin and worgen starting zones at a lot of major gaming conventions, which means a good handful of players have had the chance to try them out. Nostra from popular lorecrafting site Scrolls of Lore is one of those handfuls, and they've written up a fantastic walkthrough of the worgen starting zone, starting from your character's royal connections and subsequent infection and culminating in Deathwing's cataclysm.
What's not explained (so far, likely because no one's able to get that far yet) are how the night elves play into the whole worgen "thing" as shown in the Cataclysm trailer, but there's still a lot of new information on phasing, quests, and scenery in Gilneas besides what we've already covered, as well as accompanying photos. It's definitely worth a read.
Hopefully Blizzard will continue to fill in more blanks in the worgen storyline as we get closer to the expansion's release, or maybe even update the Cataclysm site more than once every four months. In the meantime we can rely on sites like Scrolls of Lore to give us exhaustive previews of public demos like this one.
World of Warcraft: Cataclysm will destroy Azeroth as we know it. Nothing will be the same. In WoW.com's Guide to Cataclysm you can find out everything you need to know about WoW's third expansion. From Goblins and Worgens to Mastery and Guild changes, it's all there for your cataclysmic enjoyment.