FYI
I got confirmation from QA in blizzard that currently demon hunters are not eligible for loot from any world bosses for chance of mount. If you look the item drop on the dungeon journal, the mount is not listed as a drop for them. they are aware of this issue, and will most likely be fixed in the upcoming fixes. You can get PVE gear not bound to a specific class but no gold loot or mount. save your coin rolls for them until fixed.