While I did not get to play the dungeon myself, I did watch it on the internet thanks to Hadrune, so I think I'm qualified to comment on it.
Ok, maybe not, but I'm going to do so anyway.
The instance has several levels, but the boss fights seem to be concentrated in a single area. It is very possible to park ranged classes above the main area and rain death from above upon the boss and enemy players. You'll definitely have to pay attention to your surroundings. Respawn locations are random and you never know if that group you just wiped got respawned at your back when you were trying to damage the boss.
I saw a new repairable weapon drop in there. It looked like a purple 80.7 DPS 2h weapon with a balance of offensive and defensive stats requiring rank 38. It seemed to be off a player kill. No word on if those will only drop in the instance, drop anywhere, or even exist come Live.
A balanced warband is required. The main area is an open area with lots of ledges for ranged and healers to stand, but the access to those ledges is through tunnels favoring melee. I almost think I'll have to have my hammer group just running around the dungeon tunnels killing ranged and healers so the rest can safely be in the boss area. I'm not sure where I can put my cannon group. If I put them on the ledges, I risk them getting ganked by respawns or roaming melee assist groups. If I put them by the boss, I'm forfeiting the high ground.
I probably want my anvil group holding the middle ground protecting my bomb group. But if there's melee trains running around, an anvil group is best way to shut that down. I need to damage the boss, but I need to kill players and not have my team die too. When a side wipes, the other has to focus on the boss allowing the wiped side to regroup at a random location giving the wiped side the element of surprise.
This looks like it's going to be a tactical nightmare with two good armchair generals facing each other with balanced warbands.
I, for one, welcome the challenge.