@dengarsw:
"""A dead server from 4.2 to 4.3 will have the same appearance and same lore as a highly populated server (again, unless I'm missing something big)."""

I see this as a positive point. It means low pop servers aren't barred from enjoying the lore.

@Hob:
The zombie invasion, for me, was the worst thing to ever happen in WoW. Nothing even comes close. I cancelled two accounts over it (one permanently, one for 6 months).
Simple reasoning. Any MMO dev wants my subscription money, they better make a game I enjoy playing. I have many other alternatives out there, and I believe the best way to demonstrate my displeasure is by closing my wallet.
Not that I dislike big events. What I dislike is any form of non-consensual PvP, as well as when I'm not given a choice to ignore the event. The zombie invasion combined those with my aversion to most things zombie-related, and a plethora of bugs, that was enough to make me really angry at the game and the developers. I swear, at the time, if I had met whoever had the idea for the event, I would be hard-pressed to not punch him.