Sorry to break it to you but no matter what you do whether it be roll out servers or monitor increasing them, there will be servers that run low pop due to people quitting the game. No MMO can withstand this, people will play for 30 days and your numbers will drop.
In fact your most loyal and dedicated fan base IS YOUR PRE ORDERS...these are the people that are sure about playing this game moreso than those waiting to pick it up in store...its a pretty safe bet to open servers and let these people in and use that as a guide to what release day will bring.
Stop feeding us bureaucratic garbage....most of us have gamed too long to buy into what you are telling these wow fanboi's