I hope we see ogres as part of the Horde in possible sequels too. Unfortunately there's nothing pointing to their appearance in this first movie (?), but I think they should be part of the Horde when they first cross over to Azeroth (e.g. Cho'gall leading the first attack on Stormwind: wow.gamepedia.com/Cho%27gall#First_and_Second_War)