The boys in blue have posted some information about the new faction...
The Cenarion Circle's main expeditionary force in Outland is known as the Cenarion Expedition. Though it began as a small venture controlled directly by the Cenarion Circle, the expedition has become a large and fairly autonomous body. The expedition is based at Cenarion Refuge in the far east of Zangarmarsh, immediately west of Thornfang Hill in Hellfire Peninsula. You can view the rewards, as well as learn a little more about this Burning Crusade faction here. We will be updating our Factions section frequently with new rewards and faction pages so check back often!
Thanks
http://www.worldofwarcraft.com/info/bas ... rionxp.xml