Blizzard has now published previews on the new spells, talent trees for level 60 – 70 and even included talent calculators on the Official Burning Crusade Website. You can find the new Rogue Talents and Spells here.
Rogues get a ranged-thrown-weapon-slow-and-finisher, a silence opener, evasion will also work for ranged attacks and shiv, an attack to apply poison from your offhand weapon.
Mages, Warriors, Paladins, Shamans, Warlocks and Warrior Talents can be found here as well.
There is no information yet on druids, hunters and priests.