I had an idea, what if you could buy and register a new non-tbc account and add wotlk to it? is that possible? Like having a death knight at max level 60? I dont know if you have to have TBC to be able to add WOTLK. Anyone knows?
Not only is it required, I'm pretty sure they've merged vanilla and bc. I bought two additional vanilla accounts recently (and no I didn't buy the battlechest), and automatically had BC on both.