Following a massive outcry on the official forums, Elitist Jerks, and pretty much every paladin site in existence, Blizzard changed Divine Plea to only decrease healing by -20%, but it is now a dispellable buff.
To be honest, I always assumed it was dispellable. Every other paladin ability is.
Infusion of Light
No changing on Infusion of Light. Holy is still looking very boring.
Honestly, there's nothing to look forward to in Holy. I macro Divine Favor and Divine Illumination to HL11, that's how boring those two abilities are. Holy Shock is kind of cool, but it's been lackluster for so long, it's hard to get enthusiastic. And even then, without IoL, HS loses a lot of its new shine.
You look at Ret, and you have Vengeance, Crusader Strike, and Divine Storm to look forward to. In Protection, Avenger's Shield is more exciting than all of Holy combined. You get to throw your shield at people like Captain America! Never gets old. (Though, the 10s daze is a little excessive. Takes the mobs a bit too long to get to you, and the fighting to actually start.)
If this is intentional, it is a big nerf to JoW. However, I sort of see the logic behind it. JoW is a very powerful buff that only a paladin can provide. Blizzard is trying to move away from buffs which only come from one class. If JoW had remained unchanged, it's quite possible that having a paladin would be mandatory for any raid content.
It is a severe hit to an ability that we love. But Blizzard's goal of making it easier to form a raid--being able to bring people because they are more skilled or are friends, instead of bringing them for their buffs--is more important than JoW being powerful.
On the other hand, I don't think this change should apply to JoL. Healing scales in a way that mana regeneration does not.