Hey, this is my first post and I don't frequent this section of the forums much but it seems to be the most appropriate place for this as I haven't investigated it enough to find an exploit from it.
In Shattrath (Talador) there is a random little hill that when you step on it sends you 500m in the air. People with gliders/slow fall should be able to use this to explore new places and of course there could be similar spots scattered around Draenor.
Kind of hard to tell I guess but make sure you have something to stop you dying from the fall. As the particle trail eludes to, you do go fairly high up.
This is where the area is.just in front of my character in the screenshot is a small hill and a building, jump into the crack between them and that is what sent my flying. (I know there is something wrong with my map, didn't update at all while levelling)
Disclaimer
I haven't had anyone else repeat this yet but I logged on after the maintenance and it still worked for me. I can provide some more screenshots if needed but it would only let me do 2 in the first post.