They tunnelized it. One straight tunnel with a bit of trash inbetween each boss. No side bosses, no room clears before gandling etc...
They also combined SM Lib/GY/Armory into one dungeon.
Two of the more interesting dungeons in the game and they turn them into McWow happy meals. It's rather depressing zoning into them for the first time if you have any nostalgia for the originals. I wouldn't have minded the change so much if they had kept the original normal versions for lowbies, and just put in the revamp for the heroics, but they completely got rid of the originals alltogether.