All in all I like the TI model a lot - but I AM worried that Blizz might take the wrong lessons from this when moving into WoD.
For example, what I enjoyed are the random rewards you can discover - but honestly I do not necessarily enjoy the method of "mass killing everything that lives and breathes over and over again" to find it. It feels literally like perpetual farming of rapidly respawning raid trash.
I enjoyed the silver elites that spawned and REALLY enjoy that we can kill them COOPERATIVELY. I wish they would've extended that to ALL mobs, not just the silver elites.
I enjoyed all the "buff" items that made farming there a lot easier. I did NOT enjoy having my bags filled with MORE extra crap I had to carry around.
I enjoyed that most of the chests were specific to YOUR character per week. That was a nice touch and doesn't make you into a race-panic with other players. Indeed it would allow you to cooperate with them to SHOW them how to get to the chests instead.
I enjoyed how everybody we met over in Pandaria, NPC wise, finally groups up here for a big send-off, so to speak.
One thing I'm worried about is if they plan to put this forward into WoD, I think TI works well because it's a SMALL island. Barely half a zone's worth in size. I can't imagine zone-wide aspects of racing back-and-forth for endless mob-farming.
I also don't want mob-farming to become the main focus of the game either. I REALLY REALLY enjoyed Pandaria's "optional" gameplay alternatives - which is what a REAL MMORPG should have! I want those to have just as much impact as TI Mob Farming.