Anyone else think it would be fun to use the new trees to create a Romeo & Juliet style setting? Something a little bit like the civil war on Onderon in KOTOR2 or Verona in Romeo and Juliet where there is a big civil war and frequent duels in the streets.
Come up with an honor system and make it matter enough to be a big motivator and let all the players know that they might want to grab ancient swords and combat styles. Have a lot of plot about wittily scoring honor off of the rival faction, covering up their involvement in illegal duels and deciding when it is worth taking the insult or risking the fight.