After speaking to a few people I thought it might be helpful to mention a few things about the new inferno missions.
1. Everyone in your team needs to get the mission. It isn't like the old missions where one person speaks to the NPC and everyone else gets an update.
2. Everyone in your team needs to get the SAME mission. So one guy can't have Unredeemed easy, another Unredeemed hard and the last guy with Brink medium. Whoever talks to the NPC inside (I believe) sets the mission type though this is unconfirmed.. it could be the first person to step in.. haven't figured that out yet.
3. Omni/Clan/Neutral can team together (mixed faction teams) as long as everyone takes the Brink mob option (versus Redeemed/Unredeemed).
4. Talking to the Yutto, inside, starts the mission and spawns 3 spirits. Don't attack the 3 spirits on the platforms.. those are the guys you are trying to protect
5. Your goal is to defend the 3 spirits. I've heard of a couple different working strategies from having 2 guys at each spirit just defending their zone to 1 person guarding each spirit, rest in middle and the guards calling out when mobs spawn in their location so everyone goes running.
6. You need to break team and reform if you plan to do another round. If you finish the mission, go roll a new one, and rezone into the mish area you'll find yourself in the same zone your team was in before. This also applies if you fail the mission.
If anyone else has any helpful tips post please