Now I've been looking over my level 100 characters, and during the process of leveling I only received a perk every 2 levels instead of the intended perk each level. With that being said I did not receive all of the perks that were possible to achieve, is this the same with everyone else? I may just be missing something here but here is the original post from MMO Champ about it saying that it should have been once per level. If anyone else can give me some feedback that would be greatly appreciated!
Warlords of Draenor doesn't really add more abilities to the game but will introduce perks for your existing abilities! Each level, from level 91 to 99, you get a random perk (that you don’t already know). By 99, you learn them all, but different players will get them in a different order.
You get them all but originally half of them were just "X ability does Y% more damage." They ended up just baking in the damage modifiers to the spells and decided to go with 4 perks and a level 100 talent.