Blizzard is at work on the next World of Warcraft expansion, but before that happens, they are looking back at Cataclysm. There's an interview with Lead Encounter Designer Scott "Daelo" Mercer who takes part in a post mortem on Cataclysm's dungeons and raids.
"Q. What do you think worked best?
We’ve been reasonably successful with our tuning across all four raid difficulty modes. There were a few warts here and there, but we delivered on the idea that 10-player and 25-player raids could exist at a similar difficulty. We also had some memorable dungeons and cinematic moments in Cataclysm. I’m particularly fond of the interactive bombing run in Grim Batol involving the red drakes. Players really got a sense of the epic scale of Grim Batol, and how well they performed in the event could make clearing the rest of the dungeon much easier."