I've only played a few classes so far and I'm only using non-spec skills (based on the main talent calculator on battle.net) and this is what I've come up with:
Druid: Replace Maul with Swipe (for tank aoe)
Hunter: Replace Eagle Eye with Multi Shot (for dps aoe)
Mage: Replace Shatter with Ice Block (survivability skill)
Paladin: Replace Cleanse with Heart of the Crusader (would be nice to have the extra mount speed for my FC paladin to make sure he gets to a flag before a less powerful player)
Priest: Replace Flash Heal with Binding Heal (slightly less heal per target but heals your target AND you)
Rogue: Replace Pick Pocket with Sprint (I miss Sprint)
Shaman: Replace Cleanse Spirit with Frostbrand Weapon (would be cool to see how that helps Enh)
Warlock: Replace Voidwalker: Suffering with Succubus: Seduction (CC)
Warrior: Replace Battle Stance with Berserker Stance (I really wasn't sure about what to pick here, but in PvP it seems like this might generate more rage, though I know nothing about Warriors)