There are 40 source servers and 15 destination servers listed in the table. This transfer and eventual merge will affect every server except Phoenix Throne, which is widely regarded as the most balanced and stable server for all of Warhammer Online.
Perhaps the most interesting part of all this is a speculative tool called the Warheap active server list. If you look at Mythic's official list of destination servers, you will notice that they almost identically match the only servers listed on Warheap with active rank 40 RvR taking place. We were originally sceptical about how accurate this tool was but now we're believers. The only question remaining is how accurate the activity numbers really are. (Incidentally, they are scraped from Mythic's very own Realm War site.)
Some people may take this news negatively, but WAR subscribers have been begging for server merges for months now. It appears they are finally getting their wish, which can only improve the game. You need people to RvR with, right?
UPDATE - Mark Jacobs made an official response:
Over the last few months we've been telling people to transfer off the lower population servers. Over this same amount of time people have been asking/telling/begging us to merge servers. So, now that almost all the people transferred off those servers, we've done just that. And of course, when we do that, some people here say "OMG Fail!"
As I've already said, if WAR was a PvE game, we wouldn't have closed those servers but since WAR is RvR-centric, leaving those servers open with their current population would not be a good idea. While these servers have been low population for quite a while once we told people to transfer off of them their population dropped too low for an RvR-centric game.
Oh, and as an FYI, once again our number of paying subs in NA went up again yesterday as did our PCU (even with backing out the trial accounts). These are undeniable facts, not spin.