Quote Originally Posted by JohnGabriel View Post
Lets say on release Classic has the lowest participation ever of WoW in its history.

Ion announces an achievement for reaching 60 that earns you a full titanforged mythic raid gear reward in retail.

Classic has the highest participation ever and several minute queues to log in.
They've announced no achievements/transmog in Classic and no transfers from Classic to Modern. Personally, this is something I think they might change and allow achievements/transmog earned to escape to Modern accounts/characters as a way to increase participation. They also might not as it will piss off the Classic purists, question is if it's enough to be not worth the additional engagement.