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Several social features were briefly described in interviews:
When a friend joins a queue, a notification is sent to their friends encouraging them to queue as well.
Improved group communication and social circles. Examples - friends you enjoy raiding or PvPing with.
Profession Updates
Several profession improvements were briefly described at the Sunday dev talk:
Professions are a focus in Legion, after Garrisons replaced too much profession functionality.
There will be quest lines for each individual profession.
Systems changes - updates that improve UI and add new functionality to gain expertise in individual recipes.
Flying in Legion
Flying will not be in Legion at launch.
The Warlords solution of Draenor Pathfinder strikes a good compromise between letting ground-based gameplay to shine, and allowing people who have completed content to take to skies.
In Legion 7.0, the first steps to unlock flying are available.
The devs respect that players want to use their flying mounts.