To answer what happened is just that, they consolidated several servers to create 'super' servers, so everyone had a fresh start. Like this poster I quoted pointed out, BW decided to name the new 'super' servers the same as certain old servers to create some feel of familiarity. All kinds of fail.
They tried to convince those of us on 'origin' servers to transfer willingly to 'destination' servers ahead of the merge, though, which strongly implied those servers were the ones sticking around. Otherwise, why bother trying to encourage folks to move to one of the destination servers of their own free will ahead of the crunch?