The Story
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Set in a misty, woodland continent (similar to Medieval Britain) where a civil war has broken out among Factions. Each Faction has a citadel (possible ideas for new Guild Halls) where it's base of operations is set. The story could include making your character siding with one of these Factions to neutralise the others, or to try and settle the Civil War at the (initially unknown) cause.
New Classes
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I've noticed the additional campaigns so far have had a "offensive" and "defensive" class added. So sticking to this pattern I thought of:
A type of Pikeman, prehaps?
New attributes such as Polearm Mastery, and a Primary that improves effectiveness of Stances.
I had the idea to make this a defensive kind of character who runs in first, then uses a stance that makes the character unable to attack, but so long as he doesn't move or attack, nearby party members gain armour and high chances of "block".
Looks like an old Cavalier with Decorative Chain Armour.
A second I thought of may be too similar to Warrior or Assassin, but here goes.
Possibly a type of Highland Berserker. Very little armour but a Primary with inherent that constantly adds small amounts to armour and movement speed.
Blunt Mastery for use of small clubs and makeshift weapons, but the benefits of combining with Warrior class is quite obvious here.
Possibly only a form of body Tatoo/Wrapping for Chest/Head (banadana?

Was hoping some die-hard Guild Wars fans out there could help me fill in the blanks and give me feedback.
Let me know what you think.
Appreciated!