Well, looks like I was wrong. Possibility #3 (an unbalanced game) was correct.
As an aside, it's funny how Blizzard always releases controversial changes on a Friday. Changes that will be positively received come out earlier in the week.
More thoughts to come later.
Edit: It could also be a complex joke. Blizzard did something similar with the wisps. But that was on April's Fools Day. The problem is that Blood Elf Paladins/Draenai Shamans are too close to an actual solution for any faction balance problems that may exist.