Detail
Classic: Paladin Warhorse (40) and Charger quest (60); Warlock Felsteed (40) and Dreadsteed quest (60). Forever: Found Photos panel shows level-60 charger quests, 'Redemption' for Alliance and one 'in the name of Retribution' for Forsaken paladins. No published Forever change to warlock mounts.
Confidence note
Confirmed-official (charger quests) / Classic-baseline (rest)