Patch 3.3.3 has a lot of data in it in regards to Cataclysm’s epic prologue. If you wish to see all the quests including a Mechano Tank Tutorial then head on over to one of my favorite sites mmo-champion where they have an awesome organized post in full relation to the prologue including some smexy overcloaks.

There is also some juicy tidbits about the involvement of the Twilight Hammer and how they are part of “Dooms Day”

http://www.mmo-champion.com/news-2/cataclysm-prologue-gnomeregan-and-the-echo-isles/