On World of Raids a brave Group of Adventurers has posted some very nice Screenshots from the Burning Crusade Level 70 Instance Karazhan. They also have a nice movie and a lot of loot. From what I can see the Instance looks truly amazing be sure to check it out here.
Interesting for Rogues is the Elemental Ripper with a Max Damage of 176, 1.8 Speed 81DPS and the Shade of Aran Melee Cloak with 22 Agility, 18 Stamina, 30 Attack Power + 1% Hit.
Be sure to check out the whole thread on World of Raids.