Guild Wars 2: Heart of Thorns: The Expansioning

What better time to revisit ye olde website than the announcement of the brand new Heart of Thorns expansion? In case you haven't seen it yet, or want to see it again, here's the trailer:
A super quick summary of everything known so far:

1 new profession, "Revenant."
    Channels the powers of legendary beings.
    Uses staff.
Guild Halls.
Mursaat.
    Allies(?)
Maguuma Jungle maps
    "Verticality"
        Canopy Treetops
        Jungle Floor
        Underground Roots
Masteries
    Hang Gliding
    Lore
Specializations (Only 1 per profession)
    Ranger --> Druid
    Engineer + Hammer (weapon)
    Engineer + Flying Drones (skill)
    Necromancer + Greatsword (weapon)
    Mesmer + Time (skills)
PvP Content
    New Gamemode
        Guild vs Guild (Stronghold)
    New WvW map
New (nonplayable) Races

More info at: https://heartofthorns.guildwars2.com/en