I wonder how that's gonna work out... I mean, having the ability to get to lvl 80 if you have WotLK, but not 70 if you have BC... did Blizzard ever say anything about that little issue that may occur?

Unless your plan is to stay at 60... in which case that will be all good too. Also for those that have BC and dont want to buy WotLK off the bat and wanna have their 70s...

We wont discriminate unless you're an outsider and shunned!