http://www.mmo-champion.com/content/

Priority #1 going forward is a steady stream of content.
The team is never going to rush an expansion, they will come out when they are done.
Ensuring there is always content in the live game while working on the expansions is important.
Raid tiers should last around 4 to 5 months.
Patch 7.1 - Return to Karazhan
Karazhan is coming back as a large dungeon, all nine bosses
Old Karazhan is staying
There will also be a raid between Nightmare and Nighthold, small, wrap up the Stormheim story.
Outdoor content
Patch 7.1 coming to the PTR right after Legion launches!
This time around there won't be a content drought.