This from www.worldofraids.com regarding upcoming 2.3 patch:
General
•New Flying Mount added. Requires 2,000g and Exalted with Cenarion Expedition. (UP2)
•Healing Reduction effects now affect all Drain spells and abilities (i.e. Mortal Strike vs Drain Life)
•Level 20-60 Quest EXP has been increased, while EXP to Level has been decreased. (src)
•Guild Banks added to the game. (src)
•New Arena Relics have been added for more talent specs, and existing Relics have been renamed to create a more consistent naming convention. (src)
•1/3rd of +Healing will count as +Dmg (src)
You might want to reconsider your alt multibox teams. Not quite sure if normal mobs will yield more XP or if instancing will give more, but with a more forgiving leveling curve it might be easier next patch.
Connect With Us