Blizzard has added multiple Darkmoon Faire-themed horse mounts to the game that will be available in the Trading Post after Patch 11.1 goes live!
Violet Darkmoon Charger – Costs 575 Trader’s Tender.
“This steed carries the mystery and magic of the Darkmoon Faire on its back.”
This mount goes well together with the 
Ensemble: Darkmoon Harlequin’s Bells set that you can currently buy from the Trading Post Anniversary Vendors.
Midnight Darkmoon Charger – Costs 575 Trader’s Tender
Lively Darkmoon Charger – Costs 575 Trader’s Tender
“Draped in tattered circus banners, this eerie mount is a perfect blend of shadow and spectacle.”
Snowy Darkmoon Charger – Costs 575 Trader’s Tender
We also have a video covering all models, courtesy of LeystTV.