It says right on the post that the outfit won’t be available until MoP Classic pre-patch. I think it’s Classic Only.
The Sha-Infused Heroic Pack costs $40 USD and contains items for both Retail and Classic WoW!
Sha-Warped Cloud Serpent (flying mount)
Sha-Warped Riding Tiger (ground mount)
Sha-Warped Tea Set (toy)
Merriment (pet)
Ensemble: Stormstout’s Sha-Warped Collection transmog*
*Available during MoP Classic Pre-Patch