World of Warcraft: The Burning Legion Details?

According to a post by someone named "Spy Bot" on the WoW Guru forums, the new World of Warcraft expansion will feature two new races, a new Spell Breaker class, nine new high-level instances, and more. While everything in the post sounds legitimite, I wouldn't consider any of it as fact until the expansion is revealed at BlizzCon. Three of the instances mentioned:
Naxxaramas Necropolis

Within Stratholme, near the Slaughterhouse of Baron Rivendare, is the Naxxaramas Necropolis. Kel'Thuzad reigns the Undead Scourge from the Naxxramas Necropolis. This new 40-player, level sixty raid instance is equal in difficulty to Blackwing Lair, and will send the player to assault the Tower of Medivh.

The Tower of Medivh

This tower was described by Medivh as an Hourglass. As the sand particles flow slowly through the hourglass clock, time flows in different places of the glass, allowing one to see the past - and future - of Azeroth. This is a 40-player max-level raid instance, much more difficult than Naxxaramas Necropolis.

Caverns of Time

This is the lair of Nozdormu, one of the five great dragon aspects. Nozdormu, unlike most other dragons in the game, requires the aid of mortals. To repair damage done to the timeline, Nozdormu will send players on large raids into two 40-player, level sixty raid instances, and one 40-player max-level raid instance, the first two being equal in difficulty to Naxxaramas Necropolis, and the final being equal in difficulty to The Tower of Medivh.