For WoD I expect similar to MoP. Blizzard don't really seem that interested in making questing a great adventure, it probably works out great for them too because most of the kids don't like having to quest they want everything "now, now, now...FAST!!!", its the perfect excuse to pour less resources into the leveling experience.
So over the course of the game you're implying that they are spending less resources on leveling now than they did back in vanilla/tbc? I think you should go back and take a second look.