There's no indication of when exactly we might see this reward return as of yet. Previously, the mount was offered exclusively either through a Diablo III Annual Pass Promotion or for a couple brief times on the Battle.net Shop.
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In today's PTR build, the source for Tyrael's Charger has been updated to the Trading Post. We'll likely see this mount return as a potential reward option at some point from the rotating monthly stock of rewards in the Trading Post.