Created a thread to help tally up all the information from the Expac reveal.
Here's what I've skimmed so far.
-Dragon Isles were left by the dragons in the hands of Watchers, but something kept the Watchers from doing their job so the isles are in disrepair.
-A bunch of old races from Kalimdor and EK are in the isles but it's unclear what their deal is (Centaurs on the Dragon Isles seem to predate the birth of their Kalimdor species? And have some kind of deal with the Green Dragons?) Swole Gnolls, Furbolgs, etc
-Deathwing made the Dracthyr (race/class combo) to be his ultimate soldiers, unclear if this is before he went crazy (To protect azeroth) or after (To conquer it)
-Alexstraza invites the Alliance and Horde to help the red flight to help reclaim the isles