Magisters' Terrace is a new 5-man instance located on the Isle of Quel'Danas which will be implemented with Patch 2.4. The instance features four bosses: Selin Fireheart, Vexallus, Priestess Delrissa and none other than Kael'thas Sunstrider himself, who has returned despite his "defeat" in Tempest Keep: The Eye.

Instance: http://www.wowhead.com/?zone=4095#bosses

The plan is to rep grind before LF1m starts at 1800   

This instance is supposed on-par with SL. No really unique bosses.. there is

- Selin Fireheart (Warlord Kalithresh in Steamvaults) http://www.wowhead.com/?npc=24723

- Vexallus (Curator except the tank wants to gain aggro on the energy things) http://www.wowhead.com/?npc=24744 (Note: he drops [item]Latro's Dancing Blade[/item] as the companion to [item]Latro's Shifting Sword[/item] meh)

- Priestess Delrissa (Moroes... adds are 100% CC-able) http://www.wowhead.com/?npc=24560

- Kael'thas Sunstrider (a 2 phase resemblance of himself in TK complete with gravity lapse) http://www.wowhead.com/?npc=24664

Sign up if you are interested:
I plan to go as Ardea (healingor Tanking) or Porter... Lepp at least once for the quest reward http://www.wowhead.com/?item=35488