OK, so think of this, say you are multiboxing with 5 shamans.. and you have this new spell called frozen power.. Which freezes the target for 5 seconds.. from 15+ feet away... Now this doesnt look so hot, untill you notice that there is a thing called round robin.. This only shoots this on one toon then the next.. next.. and so on every time you press it.. So, essentially you could click this on a pvp target 5 times every 5 seconds to have them frozen for 5seconds x 5 which is 25 seconds.. and that well = dead. This will help alot in the multiboxing world, and I cant wait to go out and do it. Also, the talent that reduces the CD of frost shock (which freezes them) willl help you get more of these off.. This would create a constant hold on someone because all the CD will be up before the person can get it.. Now for arena you could select different people to freeze the team and do some huge chain lighting to pawn em up.
Hear are the main things I think will benifet mutliboxers
Shaman:

* Bloodlust/Heroism: Cooldown reduced to 5 minutes, but Sated and Exhausted now last 10 minutes.
* Poison Cleansing Totem and Disease Cleansing Totem have been merged into "Cleansing Totem." Cleansing Totem pulses every 3 sec, down from 5

Enhancement
* New Talent: Frozen Power: Increases the damage done by your Frostbrand Weapon if it is enchanted on your main-hand weapon by 10/20%, and your Frost Shock has a 50/100% chance to root the target in Ice for 5 sec. when used on targets at or further than 15 yards from you.
* Toughness: No longer increases your armor. Instead, this talent now increases your total Stamina by 2/4/6/8/10%.

Elemental

* New Talent: Booming Echoes- Reduces the cooldown of your Flame Shock and Frost Shock spells by an additional 1/2 sec., and increases the direct damage done by your Flame Shock and Frost Shock spells by an additional 10/20%.