Removed Mounts and Battle Pets in Warlords of Draenor

There are going to be many changes in Warlords of Draenor. In this post I will include the mounts and battle pets that will be unobtainable in the new expansion.
Hurry up ! If you still don't have those mounts/companions, you should start working because you don't have much time.

Mounts:

•  Reins of the Kor'kron War Wolf

Rewarded to players who complete the achivement:  Ahead of the Curve: Garrosh Hellscream (10 player) or the 25 player version:  Ahead of the Curve: Garrosh Hellscream (25 player).

The other unobtainable mounts will be the Pandaren Phoenix mounts.

Completing  Challenge Conqueror: Silver rewards  Ancestral Phoenix Egg. Before 6.0 hits, you can redeem it for one of four phoenix mounts. However, when 6.0 hits, if you already had one mount, you automatically learn the other three. All of these mounts are then account-wide in 6.0.

•  Reins of the Violet Pandaren Phoenix
•  Reins of the Emerald Pandaren Phoenix
•  Reins of the Ashen Pandaren Phoenix
•  Reins of the Crimson Pandaren Phoenix

Battle Pets:

Thundering Serpent Hatchling: This pet is a reward from  Challenge Conquerors: Gold - Guild Edition, completing all Challenge Mode Golds in a guild group. After 6.0 it will not be possible for your guild to earn this achievement. 

This pet currently requires Revered with your Guild to purchase. WarcraftPets has a list of guilds that are willing to invite players simply after the pet.

• Thundering Serpent Hatchling