So, some posters on the Scrolls of Lore forums finished the Talador story in the beta, and there were some huge story developments there. Thought I'd repost them here.
All credit to Halibell from the SoL forums!
Massive spoilers!!!
At the end of the Talador storyline, the players join Durotan, Maraad, Khadgar, Draka, and Yrel in a strike force to repel the Iron Horde from Shattrath and kill Blackhand. You succeed in reaching Blackhand, just in time to see Orgrim Doomhammer confronting him for his actions with the Iron Horde. Blackhand declares Doomhammer a traitor and kills him before you can reach them. (Durotan is shocked to see his "brother" killed like that.) Your task force attacks Blackhand and manages to force him to retreat, but before the scene ends (in an unimplimented cutscene, so not sure exactly how it happens), Maraad is also killed.
Doomhammer's death is pretty meaningless to me; this version of him had pretty much no history before his death that I know of. Maraad, on the other hand, is a huge shock to me. I mean, he's been hyped up so much for this expansion, he's even considered one of the titular Warlords, and is the primary Alliance hero for the expansion! It's not even an AU version this time, this is our Maraad being killed off in a levelling zone. Pretty disappointing to see him die like this, but now I just have to wonder how it will impact Yrel's character. Just hope Durotan and Draka survive to join us in Azeroth...
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And a very spoilery screenshot post that proves all this:
http://www.scrollsoflore.com/forums/showpost.php?p=1166169&postcount=4706