Unfortunately, not much Paladin-specific information was released at the WWI today, and right now Paladins are the character class we know least about with regard to Wrath features/changes/improvements. This is what we were told today:
Retribution paladins will share their itemization with Death Knights and Warriors. Their group utility will be increased by making them more efficient DPS-wise. Retribution paladins itemization will be moved to the same item as Warriors/Death Knights. A new reactive healing spell will be added - Hand of Purity. Paladin's short-term-blessings no longer overwrite long-term-blessings. [not paladin specific]There is a plan to give player access to two talent specs to switch between them without having to respec all the time. More details in the future.
from MMO-Champion. More information about other classes can be found in that post too if you are so inclined.
We can theorise till the cows come home about these changes, but frankly right now they are neither the sorts of premier talents like the Warlocks Demon Form, nor abilities which make one think 'hrm, I wonder what that's going to work like' such as the new Hunter Pet Talents.
With any luck we'll find out some more information tomorrow in the PvP discussion panel. Also hopefully there will be a new Alpha build with Paladin Spells/Talents when Hunters get theirs. However there is a very real danger that we'll not know anything about Paladins until well into August, and absolutely nothing 'officially' until Blizzcon/Closed Beta (whichever comes first). Now that would be an unfortunate state of affairs given the history of Paladin development.