Originally Posted by
Tiberria
They are probably just saying "as soon as" to cover their asses in case they change their minds at the last minute for some reason. It's the same reason as why when they give the 2 week PvP end of season warning they word it as "as soon as X date", not "on X date", so the opportunity is there to delay it if they need to.
As far as taking the MoP CE down and the argument that not putting the WOD CE up immediately would cost them money, consider this. Doesn't taking it down regardless of the status of the WoD pre-orders cost them money to begin with? Why not just leave that up indefinitely even after WoD pre-orders have started so they can keep collecting money from people who 2, 3 , etc years down the road decide they want to buy the MoP CE for the pet and mount? The fact that they are taking it down at all is inherently costing them money regardless of the WoD pre-order status, so I think it's entirely possible they are just taking it down because they've decide to take it down, not necessarily that it has anything to do with pre-orders and especially beta.
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If they do something like that, they just have to make it very clear on the website that beta invites will be done in waves and everyone that pre-orders will be guaranteed to get at least X months of beta access prior to release, but not guaranteed to get in immediately.