Definately AoE loot.
pokemon, i mean pet battles
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My favorite part would have to be the unlimited amount of dailies you can do, now I don't have to pick which factions I want to work with; I can do all of them if I want! Plus, the aoe looting is very nice. Also, I can't forget those pet battles and the fact that you can name them all, yay! Now my real-life pets have a place in WoW too!
Pet battles! and the music, the music is pretty chill
The Improved cross-realm functions, more of this. Unite the factions with themselves, improve both sides chances of becoming even more recourse-full. Creating Greater Communities.
I would have to go with the new raids, I feel now as a tank I have to do work. Will of the Emperor is an amazing fight as a tank, even Elegon is a good fight. In the past as a tank I would just stand there and get hit, Will of the Emperor I have to dance :D to avoid getting hit not to mention if I do my dance right I get a bonus in dealing damage to him. So the new raids are defiantly my favorite part :)
AoE Looting hands down... Nothing like pulling a huge group of mobs with a nice little blood DK and just looting them with one click... Pure magic...
My favorite part of MOP are the quest/story improvements. Solo questing feels much more immersive than it ever has in.
Being a Pandaren Monk and having a Pandaren Monk companion.
New pvp style and new story line.
I honestly LIKE the dailies. I'm not a hardcore raider, I'm content with just being a casual LFR raider. I don't like running LFD dungeons with people I don't know. For content I'm content with going out and doing my own thing, like doing dailies or looking for new pets or running old raids but my favorite thing is just that there is so much to do at 90 as far as dailies.
I really liked the scenarios, especially with the greater cache giving me a shot at epics without having to invest a ton of time.
AoE looting for sure!