It looks like Blizzard isn't done tinkering with everything for Wrath of the Lich King. This time, they've turned their attention to racial abilities, which many have pointed out to be imbalanced. Kalgan dropped by the forums to answer a good question regarding the Orc racial Hardiness, which grants a passive 15% resistance to stuns. It's been nerfed a long way from its original 25% resistance, but the poster made a good point about the game's direction towards reduced durations instead of resistances.

Kalgan responds by saying that Hardiness was being changed into exactly that -- an effect duration reduction of 15%. He also goes over all the other racials, some of which were changed, others of which were buffed, and yet a few others of which were inevitably nerfed. The changes should make it into the next Beta push. Check after the break to see the complete list. [CLARIFICATION: This isn't the complete list of racial abilities. Abilities not listed here are unchanged or, if they will be changed, will be mentioned in the future.]

Unholy was originally touted as the PvP DPS tree. What it appears to do rather well, though, are diseases and minions. If your vision of a Death Knight is close to a Diablo 2 Necromancer type, leading an army of undead minions and spreading plague and exploding corpses across the land, Unholy is probably going to be the tree for you. Of course, your crowd control is probably going to be a little peeved at you with all those DoTs, but that's what AE spells like Death and Decay and Unholy Blight are for, right?

Unholy also seems to include quite a bit of utility, including the ability to resist lots of spells and status effects, and some debilitating debuffs, so it could be called a utility tree of sorts as well. Here's a list of some of the Unholy spells and talents available in the WWI Demo:

Unholy Spells:

Death Gate
Requires level 55
Costs 1 Unholy Rune
10 second cast, 15 minute cooldown
Description: Returns you to Ebon Hold (Note: Since Ebon Hold is not yet implemented, in the demo it returned you to Tirion Fordring).

Death Grip
Requires level 55
Costs 1 Unholy Rune
Instant cast, 35 second cooldown.
30 yard range
Description: Harness the unholy energy that surrounds and binds all matter, drawing the target toward the Death Knight and forcing the enemy to attack the Death Knight for 3 seconds.

Plague Strike
Requires level 55
Costs 1 Blood Rune and 1 Unholy Rune
Instant cast
Melee range
Description: A vicious strike that deals weapon damage plus 37 and plagues the target, dealing 350 shadow damage over 12 seconds.

Raise Dead
Requires level 56
Costs 2 Unholy Runes
Instant cast
30 yard range
Description: Raises a ghoul from a corpse to fight by your side. if the target corpse is not humanoid, Corpse Dust must be supplied to complete the spell.

Death Strike
Requires level 58
Costs 1 Unholy Rune
Description: A deadly attack that deals 60% weapon damage. if the target dies within 6 sec and yields exp or honor, Death Strike heals the Death Knight for 406 damage.

Death and Decay
Requires level 60
Costs 1 Unholy Rune, 1 Blood Rune, 1 Frost Rune.
30 second cooldown
30 yard range
Description: 100 shadow damage modified by Attack Power is inflicted every 2 seconds to all targets in the affected area for 10 seconds. Has a chance to cause affected targets to cower in fear

Degeneration
Requires level 62
Costs 1 Unholy Rune
Description: Instantly attack the target, dealing 60% weapon damage and inflicting a disease dealing 91 damage over 21 seconds. Any existing heal over time spells on the target become corrupted, dramatically increasing the damage done by the disease and removing the healing effect. Stacks up to 3 times.

Unholy Presence
Requires level 70
Description: Imbues the Death Knight with unholy fury, increasing attack speed by 15% and reducing the global cooldown on all Death Knight abilities by 0.5 seconds.

Anti-Magic Shell
Requires level 75
Costs 1 Unholy Rune
20 second cooldown
Description: Surrounds the Death Knight in an anti-magic shell, absorbing 75% of the damage dealt by the next harmful spell. Damage absorbed by anti-magic shell energizes the Death Knight with additional runic power. Lasts 5 seconds.

Army of the Dead
Requires level 80
Costs 2 Unholy Runes
10 minute cooldown
Description: Summons an entire legion of your best ghouls to fight by your side.
Unholy Talents:

Lichborne
Requires 10 talent points
Instant cast, 5 minute cooldown
Description: Draw upon unholy energy to become undead for 30 seconds. While undead, you are immune to charm, fear, and sleep effects, and your horrifying visage causes melee attacks to have an additional 25% chance to miss you (Will of the Forsaken, eat your heart out!).

Corpse Explosion
Requires 20 talent points
Requires Runic Power
Instant cast
20 yard range
Description: Unleashes all available runic power to cause a targeted corpse to explode for 3.6 nature damage per 10 runic power to all enemies within 20 yards.

Improved Corpse Explosion
Requires 25 talent points, Corpse Explosion
Costs up to 2 talent points
Description: Exploded corpses cause 25% additional damage and have a 50% chance per point to cast a disease on enemy targets that deals 36% of the explosion Damage over 9 seconds.

Magic Suppression
Requires 25 talent points.
Costs up to 5 talent points
Description: You take 1% less damage from all magic per talent point. In addition, your anti-magic shell absorbs an additional 5% of spell damage.

Anti-Magic Zone
Requires 30 talent points, 5 points in Magic Suppression
Costs 1 Unholy Rune
Instant cast, 2 minute cooldown
20 yard range
Description: Places a large, static, anti-magic zone which can protect any party members inside it. The anti-magic zone absorbs 75% of the damage dealt by the next harmful spell. absorbs up to 10000 damage. lasts 30 seconds.

Crypt Fever
Requires 35 talent points
Costs up to 5 talent points
Description: Your diseases also cause crypt fever, which reduces an enemies attributes by 1% per talent point. Crypt Fever lasts for 18 seconds and can stack up to 3 times

Ebon Plaguebringer
Requires 40 talent points, 5 points in Crypt Fever
Costs up to 3 points.
Description: Your Crypt Fever morphs into Ebon Plague, which increases vulnerability to magic by 1% per talent point in addition to reducing attributes by 5%. Ebon Plague lasts for 18 seconds and can stack up to 3 times.

Summon Gargoyle
Requires 40 talent points
Requires Runic Power
Instant Cast, 5m cooldown
30 yard range
Description: A gargoyle flies into the area and bombards the target with shadow damage modified by the Death Knight's attack power. Persists for 1 second per 8 runic power up to 1 minute.

Unholy Blight
Requires 50 talent points
Requires Runic Power
Instant Cast, 1 minute cooldown
Description: A creeping swarm of unholy insects surrounds the caster for a 10 yard radius. all enemies caught in the swarm take 34 damage and are plagued with a disease that can stack up to 3 times. persists for 1s per 10 runic power.