In Wrath of the Lich King, gearing is one of the biggest changes and the way gear stats are handled A number of reasons are included - such as making hybrids more flexible and making gear pieces more useful - but here's the basic summary for Holy Paladins (and, well, all healers and casters).
  Spell crit, spell hit and spell haste ratings are disappearing. Crit, hit and haste ratings now affect both spellcasting and physical abilities.
+heal and +dmg/heal ratings are disappearing, and being replaced with spellpower, which affects both spell damage and healing.
Existing items with +healing are being translated to spellpower stats instead; it's not a direct 1:1 translation, so on Wrath Day you'll end up with a lot less spellpower than your current +heal.
This is not a problem, because other mechanics are being revamped to account for it (for instance, healing spells are getting a much bigger boost from spellpower).
Existing items with +dmg/heal are being translated to spellpower as well, at close to a 1:1 transition.
On Wrath Day, you'll see a big change in your stats: no longer will you have Spell Crit or Spell Haste, and your giant +Heal will turn into a much smaller Spellpower number.
You can see that her base stats and regen remain unchanged, while her +Healing turns into Spellpower at a ratio of about 1.6 : 1. Her spell damage increases, which means her effectiveness as a shockadin may also increase (depending on how much benefit Seals and Judgements will derive from spellpower, which is still being revised).
Of course you should bear in mind that Blizzard may revise items differently depending on the gear in question. Examplia is wearing Karazhan gear, which was designed two years ago when The Burning Crusade was being developed; characters in gear from Sunwell Plateau or badge purchases from the Isle of Quel'Danas may see different tweaks, as Blizzard's developers had eighteen months' more experience when developing those items.
Blizzard have said that the change of condensation of +dmg and +heal into spellpower won't reduce healing output; I haven't seen any equivalent statements about the effect on shockadin DPS, so it could yet be an improvement, reduction or no real change at all.
Prior to, a healing shield and its DPS equivalent, in Wrath of the Lich King these items will be all but identical - which means if you only ever got one, now it will do dual-duty. This effect can be seen in a lot of other places such as TBC stats and WotLK stats.
Once healing and spell damage are condensed into Spellpower a lot of DPS caster items suddenly become excellent for Holy Paladins.
It's obvious that the effect will become less important after Wrath Day as people start doing quests, running instances, and upgrading their gear - new caster/healer gear in Wrath only comes in one flavour, and that's Spellpower. However, the better your gear is on Wrath Day, the longer you'll take to upgrade it, and the easier you'll find questing and instancing in the meantime.
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