Originally Posted by
JeKv
Yeah, feel free to install it, upgrade your account, w/e. You won't be penalized. You just won't be able to play any Cata-exclusive content until the 7th.
This sort of thing happens all the time with games, retailers shipping them out a few days early or what have you. Nobody expects you to hold off playing the game if you get it early**. If Blizzard has a problem at all, it's with the retailer, not you.
**IF you get it legitimately. Big difference. Found an early copy at the store? OK. Downloaded a leaked pirated copy? Not OK.