Sometimes I feel sorry for Ghostcrawler. It's looking like he'll have to nerf Holy Paladins again, and I don't think they're going to take it well.
Essentially, in T7 content, paladins are able to reach around 70% crit rate on Holy Light. With Illumination, that works out to max rank Holy Lights that are 42% cheaper, and thus can be spammed. Remember that this is the first level of raid content, and it's only going to get worse.
I wonder what form the nerf will take. Another hit to Illumination? Making the Retribution crit talents only work with melee attacks? Maybe lower the intercept on the crit rating equation so that it starts very negative, but still increases at the current rate.
In my opinion, what really needs to happen is for the +crit talents in Holy, along with Divine Favor and Divine Illumination, to be removed and replaced with new talents. There is too much of an emphasis on saving mana in the Holy tree, and so far, it always ends badly. The talents really need to encourage the paladin to spend mana. Of course, I doubt a Holy tree revamp is coming anytime soon.