So I've been hearing a lot of chatter lately about the potential benefits of a different questing path than the one that I've been using in MoP. My strategy with my seven previous characters to date that I've leveled to 90 is to immediately switch to Kun Lai upon hitting level 87, then immediately switch to Townlong Steppes at 88 and Dread Wastes at 89. There is a substantial difference in the xp awarded per quest in each of those zones, so in theory, everything should go much faster taking advantage of the higher xp quest turn ins.
The counter argument that I've been hearing is that the quests are so much harder at those levels for the gear that you have, that it takes quite a bit longer to complete them than it would if you just stayed in the earlier zones, so the average xp or the xp per hour that you're getting ends up being lower.
So with character #8, my rogue, I've decided to try the other approach and go "the long way". This is going to involve fully questing out Valley of the Four Winds and Krasarang, which should get me to the point where I'm just a few bars from 88. Then going to Kun Lai and probably questing there until I'm probably almost half way to 89, then switching to Dread Wastes when I'm about 30-40% in towards 90. My average leveling time from 85 to 90 on my first 7 toons ended up being between 21 and 25 hours, so it'll be interesting to see if the rogue falls significantly outside of this range.
The next character up after the rogue is my warrior, so if the results from the rogue aren't conclusive, I'll give the same approach a try on the warrior for additional data.