In today's Patch 10.2.7 PTR, we've datamined new toys that will allow players to don the wings of the August Celestial legendary cloaks from Mists of Pandaria, such as Xing-Ho, Breath of Yu'lon for the Jade Serpent.
Since cloaks will be replaced by the new Cloak of Infinite Potential for Timerunning and the potential new meta gems (Chi-ji, the Red Crane/Bulwark of the Black Ox), it makes sense that Blizzard would create a way for these highly coveted wing effects to return.
Update: You'll need to fully upgrade your Cloak of Infinite Potential via Infinite Power XII to acquire these new toys.
Niuzao's legendary cloak was used by tank specs in Mists of Pandaria.
Yu'lon's legendary cloak was used by caster specs in Mists of Pandaria.
Xuen's legendary cloak was used by melee specs in Mists of Pandaria.
Chi-Ji's legendary cloak was used by healer specs in Mists of Pandaria.