Zealots already were known, if specd that way, to kill players with a single dot. I sure hope that those dots are nerfed. I didn't see any mention of it in the article. If these same super dot zealots are getting a big boost in their int, it might be next to impossible for even a pure healer to heal through that. And suddenly, everyone will be rolling dot zealots and you'll be fighting a group of 6 zealots soon enough! I'm getting carried away but I can see it happening if the damage spells are not carefully adjusted.
I have never agreed with a class having the potential for great healing and dps at the same time and would have rathered the AM/Shaman and WP/DoK be brought back down to more traditional healing/support roles. However, it will make for a much funner RP for many a player who have given up on their RPs due to frustrations with solo PvE.