The only midnight release event I've been to was the one for WoW: Cataclysm. And it was effing FREEZING. If MoP gets release during the coldest day of the year like Cata was, I will NOT be happy.... but I'd still go because downloading new expansions takes forever I found, so I'd go to the release event, start the download and let it go until morning so I can sleep, then play after a couple of days, because Cata release was nuts, and I couldn't enjoy the experience.