These are the announced changes we're planning in 2.3 for the Paladin class.

Mana cost for Exorcism, Holy Wrath, and Hammer of Wrath lowered
http://forums.worldofwarcraft.com/thread.html?topicId=1777967162&postId=19976316726&sid=1#146

Vengeance duration increased to 30 seconds
http://forums.worldofwarcraft.com/thread.html?topicId=1777967162&postId=19976316726&sid=1#146

Improved Seal of Crusader benefits put into base spell, talent benefits replaced with those of Sancitified Crusader
http://forums.worldofwarcraft.com/thread.html?topicId=1777967162&postId=19976315356&sid=1#4

Sanctified Crusader renamed to Sanctified Seals, which increases chance to critically hit with all spells and melee attacks by 1/2/3% and reduces the chance your Seals will be dispelled by 33/66/100%
http://forums.worldofwarcraft.com/thread.html?topicId=1777967162&postId=19976315356&sid=1#4

Crusader Strike cooldown reduced to 6 seconds
http://forums.worldofwarcraft.com/thread.html?topicId=1778047001&postId=19976313564&sid=1#39

Vindication frequency and duration increased and reduces all attributes by 5/10/15%
http://forums.worldofwarcraft.com/thread.html?topicId=1777967162&postId=19971531416&sid=1#340

Pursuit of Justice is now 3 ranks and increases movement speed by 5/10/15% and reduces the chance to be hit by spells by 1/2/3%.
http://forums.worldofwarcraft.com/thread.html?topicId=1777967162&postId=19971531416&sid=1#340