MMO Champion is collecting all the blue posts about the upcoming 2.4 patch.

http://www.mmo-champion.com/

Some things I see that apply to multi-boxing, or will affect us more than other players

No more avoiding spell haste on Shaman? Yay !
* Spell Haste: Spell haste now reduces the global cooldown on spells,
down to a minimum of 1 second. This change does not apply to melee and
ranged abilities.

Nerf to income, perhaps?
* Once every 24 hours, through Enchanting (not Alchemy) you'll be able to
split a Void Crystal into two Large Prismatic Shards. This is through a
new recipe that's being added in 2.4.

Depends on stats but these could be nice for gearing up new 70s...
* Players will now be able to purchase level 70 Superior quality PvP items from reputation vendors in Outland.



More notes are coming, so keep an eye out. I'll post in the full 2.4 notes here when they are released by Blizzard.