Hmm… I guess these and their content.
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High Tinker Mekkatorque: Gnomeregan retaken and updated.
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Ressa the Leper Queen: New leader of the Leper Gnomes and joins the Forsaken.
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Trade Prince Monte Gazlowe: Rescue Undermine.
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Mimiron: New content for player Mechagnomes to advance their mechanization.
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Fizzle Brassbolts and Pozzik: Drain Thousand Needles, build a new zone-sized race track and demolition derby arena. A kind of updated version of Argent Tournament.