The official Mists of Pandaria talent calculators were released by Blizzard recently, including a list of each talent tree's abilities. By diving into the skill list and analyzing the talents, there is a lot of information available. Most of the information is old, as we learned about many of the changes at BlizzCon and in the developer question and answer sessions.
It's hard to draw any concrete conclusions from the talent preview because the Blizzard team has stated that everything is still up in the air. Since the information is still in a pre-alpha state, I can guarantee you that what we're seeing today will be changed dramatically by the time Mists of Pandaria is released. While we can't make any firm predictions, we can gain some insight into the direction that holy paladins are headed, and we can offer feedback to the developers on that direction.