Ghostcrawler just posted on the Paladin forums, confirming that Infusion of Light was nerfed for arena balance (which, let’s face it, we all knew anyway). She followed up with “I know it can be frustrating when a PvP concern ends up making a talent less useful for PvE. We have some ideas of what we’d like to do with it though.”
This is heartening; I just hope that however they change IoL – or the Holy Tree in general – ends up giving us some mobility back. My favourite suggestion so far is to have IoL proc an instant Flash of Light instead, or for it to reset the cooldown on Holy Shock. Either would be fine; it’s the division between “instant” and “1 second cast time” that’s the important one, not the division between “1 second cast time” and “2 second cast time”.
(Tangentially, I’d happily give away all PvP content in WoW to stop PvE stuff getting balanced around it.)