The 7.2 PTR is going up and Warlock information should be trickling in soon.
First up, Warlocks are one of the classes getting three tints for our class mount. Afflic has the purple Netherlord's Accursed Deadsteed, Demo has the red Netherlord's Brimstone Deadsteed, and Destro the green Netherlord's Chaotic Deadsteed.