I don't see anything that will affect prot pally boosting. Hell in most lowbie instances, all the way up to stuff like hellfire ramparts, a ret paladin can do just as good a job, if not better than a prot paladin. At 85 with even bigger health pools just about any class will be able to boost probably up until hellfire, by sheer HP volume. Ive holy nova boosted with a priest in deadmines, not stopping at all.

Was there something specifically that you read that made you think prot pallies were getting a nerf? All I saw was that im going to need a single target DPS button and a multi target DPS button (which I already do, but the single target one hardly has any abilities to cast currently, so this is a buff, not a nerf)