I think afterall this blue posts are more a big holy nerf and than just a nerf for prot and retri (which is low nerf, they don't get that much benefict from the hot as holy does ofc)
The infusion of light seems to say:
"Infusion of Light: This talent now causes the paladin’s Flash of Light spells to heal the target for 50/100% of the Flash of Light healing amount over 12 seconds."
He's saying "this talent now causes..." and not " also causes" or " In addiction this talent now causes". I think they're completely replacing infusion with the flash of light hot , which is a shame especially because it removes instant flash of light for holy.
Infusion is really one of the few abilities that makes holy funnier (but not stronger) then prot healing, and by removing that talent i think they're doing exactly the opposite of what they said they wanted to do, that holy should appear to healers as the best healing spec for paladins. At this path, in few months, a full retri geared prot or even a "shealth of light holy pala" will better at healing than a full holy pala.(and ofc at all other roles)