Cataclysm screenshot from Blizzard is shown above, featuring a look at what appears to be a few members of the Twilight's Hammer enslaving a gronn in one of the new Blackrock Mountain regions. The Blackrock Caverns, perhaps? The presence of the gronn is interesting, because their original description implied they were strictly from Draenor. Did Deathwing bring them to Azeroth? Do they actually originate from somewhere else entirely?
Update: It's Grim Batol, says Blizzard.
If you've missed any of the previous Cataclysm screenshots of the day or you want to see a hi-res version of today's screenshot, check out the gallery below.