I'm really looking forward to all the class changes, especially for PvP. There's a lot of new things to relate to, and I wanna figure out which class and spec I should use for my main in legion. The affliction changes seem interesting, especially like the potential of the effigy to attack people that are hiding behind pillars, so I might stay warlock, but also have shadow priest and hunter for backup. Have to figure out what is fun to play and works out well for me :)