I was talking to someone yesterday and they claimed they read somewhere that mounts obtined from dungeons and raids such as baron rivendare's mount, the bear mount from ZA, etc.. would no longer be obtainable. Is that correct? I was looking forward to farming strat at level 80 so I could actually have an undead mount on my tauren.

The Zul'Aman bear will no longer be available. But the other mounts you mentioned will remain unchanged.

The reasoning behind this is that the Zul'Aman bear is obtained during an event which requires precision and skill at level 70. The accomplishment for those who have legitimately earned the mount would be diminished if we continued to allow players to obtain the mount once the level cap is raised to 80.