New factions were introduced in 5.1 for the Alliance/Horde.
As the story continues, after heroes crash land in Pandaria, both sides will start preparing for the warfare on it's shores.
Base of operations for this faction is Lion's Landing in Krasarang Wilds.
Starting quest:
Alliance / Horde Meet the Scout http://www.wowhead.com/quest=32249/meet-the-scout
Alliance Faction : Operation: Shieldwall Horde Faction : Dominance Offensive
Horde Npc's for Alliance to kill
Kar Warmaker
Ubunti the Shade
Muerta
Alliance Npc's for Horde to kill
Mavis Harms
Disha Fearwarden
Dalan Nightbreaker
Loot:
Blood-Soaked Invitation http://www.wowhead.com/item=93194
SI:7 Operative's Manual http://www.wowhead.com/item=92784
Alliance Insignia of Conquering http://www.wowhead.com/item=92786
Steadfast Footman's Medallion http://www.wowhead.com/item=92782
All rares drop {Honorable Commendation} that Grants you 250 honor. ( http://www.wowhead.com/item=93412 )
Video that shows exactly where those rare NPCs are :
Macro
/tar Ubunti the Shade
/tar Kar Warmaker
/tar Muerta
To quick add to _NPCscan copy this lines:
Alliance:
/npcscan add 68320 Ubunti the Shade
/npcscan add 68321 Kar Warmaker
/npcscan add 68322 Muerta
Horde:
/npcscan add 68317 Mavis Harms
/npcscan add 68318 Dalan Nightbreaker
/npcscan add 68319 Disha Fearwarden
Blood-Soaked Invitation http://www.wowhead.com/item=93194
This is used to invite people to the new 1v1 PVE event & Each inv is going for 50-100k gold if you are lucky enough to find some1 selling them. I am sure most of you guys saw the trade chat spammed with people WTB Blood-Soaked Invitation.