Changes that should be in the next beta push. Bear in mind that some of these may change somewhat or entirely, and there may also be other changes coming in subsequent pushes:

Orc

•  Hardiness now reduces the duration of stun effects by 15%

Troll

• Racial Passive "The Voodoo Shuffle": Reduces the duration of all
  movement impairing effects by 15%. Trolls be flippin' out mon!
• Berserking: no longer has an activation cost of energy/rage/etc

Undead

• Shadow Resistance: reduces the chance to be hit by Shadow spells by 1% (yes, this is lower than the other resistance racials)
• Will of the Forsaken: removes any fear, sleep, or charm effect (no longer has a lasting immunity).

Tauren

• Endurance: now scales based on base health, to be tuned to
  approximately a 5% heath increase if the player were wearing green
  quality gear
• Nature Resistance: reduces the chance to be hit by Nature spells by 2%

Blood Elf

• Mana Tap: ability removed (partially integrated into Arcane Torrent)
• Arcane Torrent: restores 15 energy, 15 runic power, or 6% of mana to the Blood Elf (along with the current 2s silence effect)
• Magic resistance: (unknown, possibly reduces chance to be hit by all spell schools by 1%)

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Draenei

• Gift of the Naaru: now scales based on the higher of either the caster's Attack Power or Spell Power
• Shadow Resistance: reduces the chance to be hit by Shadow spells by 2%

Dwarf

• Frost Resistance: reduces the chance to be hit by Frost spells by 2%
• Racial Passive "Mace Specialization": Expertise with Maces and Two-Handed Maces increased by 5.

Night Elf

• Quickness: reduces the chance to be hit by melee or ranged attacks by 2%
• Nature Resistance: reduces the chance to be hit by Nature spells by 3%
• Shadowmeld: "Activate to slip into the shadows, reducing the chance for
  enemies to detect your presence. Lasts until cancelled or upon moving.
  Any threat is restored versus enemies still in combat upon cancellation
  of this effect." It has a cooldown of 3 minutes, and it can be used in
  combat. In PvP it will force enemies targeting you to detarget you. It
  will cause any mobs currently on you to de-aggro, but it does not take
  you out of combat unless you are the last one on the hate list of any
  mobs that you were engaged with. It should be noted that the 5 extra
  points of passive stealth value is still there, however it isn't
  written in the shadowmeld tooltip. It is now just its own passive
  effect called "Elusiveness

Gnome

• Escape Artist: the freeing effect can no longer be resisted
• Arcane Resistance: reduces the chance to be hit by Arcane spells by 2%

Human

• Perception: changed to a passive, now grants one character level of passive stealth detection
• Racial "The Fall of Humanity": Feign death which may trick
  enemies into ignoring you. Any threat is restored versus enemies still
  in combat upon cancellation of this effect. 5min cooldown
• Racial Passive "Human Supremacy": The dominance of Humanity is
  evidenced by having one more racial bonus than normal. Actually, make
  that two counting this one. (just a tooltip, no actual functionality)
• The Human Spirit: spirit bonus lowered to 5
• Every Man for Himself: Removes all movement impairing effects and all
  effects which cause loss of control of your character. This effect
  shares a cooldown with other similar effects, such as the PvP trinket.
  This essentially means that you gain flexibility regarding what to do
  with your second trinket slot.