Did you watch the announcements? This whole post is retarded, they are adding a ton of new type of content.
Warfronts
Island Exploration
Fun new races and lands to explore.
Fun new playable races. (Can't wait to race change my Hunter to Nightborne and level Zandalari Shaman and make a Dark Iron Mage).
I'm pretty sure Legion was the turning point for Wow, they reorganized their teams and the wow team is bigger than ever. We will be drowning in new lore and gameplay / models / effects / experiences than ever before. All the content that is already overwhelming on one character, not to mention alts.