Thanks to Killajameson, here are the minimum requirements for Kara:
------------ Druid ------------
* Balance
7,000 health
8,500 mana
550 +spell damage
6% +hit
15% +crit
* Feral (bear)
415 defense and Survival of the Fittest talent
20,000 armor
12,000 health
20% dodge
1,000 attack power
20% crit chance
* Feral (cat)
2,000 attack power
23% crit chance
6,500 health
* Restoration
900 +healing
90 mp5 while casting
6,000 health
7,500 mana
------------ Hunter ------------
6,000 health
200 intellect
1,575 attack power (1,425 for Beast Mastery, 1,500 for Survival)
5% +hit
18% crit chance (23% for survival)
500 agility (only applicable for survival)
------------ Mage ------------
6,000 health
8,500 mana
550 +damage
6% +hit
15% +crit
------------ Paladin ------------
* Tank
9,500 armor
490 defense
10,000 health
200 +damage
* Healing
6,500 health
900 +healing
80 mp5 while casting
8,000 mana
------------ Priest ------------
* Healing
1,250 +healing
100 mp5 while casting
5,000 health
7,500 mana
* Shadow
6,000 health
7,500 mana
600 +damage
6% +hit
------------ Rogue ------------
7,000 health
1,400 attack power
150 hit rating
20% crit chance
Pair of 71 DPS weapons
------------ Shaman ------------
* Elemental
7,500 health
8,500 mana
550 +damage
250 +crit rating
* Enhancement
8,000 health
7,000 mana
1,100 attack power
100 hit rating
25% crit chance
* Restoration
7,500 health
9,500 mana
1,100 +healing
100 mp5 while casting
------------ Warlock ------------
675 +damage
~3% +hit
~10% +crit
450 stamina
350 intellect
------------ Warrior ------------
* Protection
490 defense
11,000 health
11,000 armor
* Fury
9,000 health
1,300 attack power
10% +hit
23% crit chance
* Arms
9,000 health
1,400 attack power
3% +hit
27% crit chance
And thanks to Wowwiki.com, here's the principle Tier 4 Loot you can hope to get:
* [Gloves of the Fallen Champion]
* [Gloves of the Fallen Hero]
* [Gloves of the Fallen Defender]
* [Helm of the Fallen Champion]
* [Helm of the Fallen Defender]
* [Helm of the Fallen Hero]
In addition to this, clearing Kara gives you 22 [Badge of Justice], which can be redeemed for goodies.