For me it is,
Dungeons, A proper fix for dungeon rewards, 2 expansions in row they haven't given us a good reason to run dungeons again, give us that back.
Scenarios, i want them back.
Activities, give us things to do each week.
Patches, giving us decent patches again like in Mists of Pandaria
Dungeons, ALOT more dungeons. They said they could add a raid + dungeons each patch in MoP, big fat lie for WoD.
Quivers, They said they would return them, i want them.
What about you?