To find the past of Grim Batol, you've got to read Day of the Dragon, the novel by Richard A. Knaak. Basically, the Dragonmaw Orc clan had captured Alexstrasza in Grim Batol, and was using her to make their own dragons.
Rhonin (who will be the leader of the Kirin Tor in WotLK) was able to break her out and free her. And that didn't make Deathwing (Onyxia and Nefarian's father, and the big bad black dragon aspect of Azeroth) very happy, because he was trying to steal Alex's eggs to make his own dragonflight. Rhonin eventually defeated Deathwing, and there DotD ends.
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