I finally got into a group in King's Breach, the instance in Scarwood Reach.
There are three boss locations in King's Breach, at the last spot you get to fight two bosses, one after the other. Our tank seemed to know the instance so we moved fairly quickly and he was nice enough to give us a heads up for any special mechanics.
We cleared out the trash from the first area, and after we had killed the last group the first boss came out to fight. She was "Hunter Suleng", she seemed to be typical tank-n-spank with adds that spawned during the fight. It seemed to be an easy fight, some of the trash that lead up to her probably hit harder. In the same area as this boss is a life-bomb, you need to get three of them. In this run the first life bomb was inaccessible, it seemed to be stuck behind a clip plane, though I hear that sometimes it is accessible.
The second boss was Ravalos, he's a large crocodile that has a front cleave and a tail sweep. On top of his melee attacks he puts a circle of some form of attack on the ground, you have to move out of it or you'll be asking your healer to heal when he shouldn't have to. There's a decent amount of crocodile trash as well for those who have the butchering profession.
We continued on through the area and ended up at the last boss fight location. At this location you get one of two random bosses either Mondrach or Autoch, both of them are griffins, we got Autoch who's main annoyance is a charge ability. Our tank had everyone stand in an alcove in a tree stump and he pulled the boss to us. This kept the boss from charging anyone and made the fight relatively simple, I'm not sure if the additional damage to the group made healing any more difficult to the healer. Following Autoch a Shadehorror Phantasm spawns in the same place he was standing. He casts an AE void bolt so at the start the tank had us LoS the boss then we all started on him. During the fight he spawns adds and at the same time becomes undamageable, the adds are elites but seemed to be easy enough. It was a fun run, I'm sure it was made easier by the knowledgable tank.