In the same interview with MrGM and Scottejay where Kris Zierhut announced Heroic Plus Dungeons, another change coming in Wrath Classic will reward Tanks and Healers with bonus rewards from Dungeons. There is even a small chance at some very rare mounts such as Deathcharger’s Reins, Ashes of Al’ar, and Reins of the Raven Lord!
Edit – In the interview, Kris Zierhut said “mount from Kael’thas” leaving many people speculating Ashes of Al’ar.