Guild Wars 2 is not releasing today. Despite the fact that GameStop is claiming the contrary, ArenaNet has stated many times -- for the last six years -- that Guild Wars 2 will be ready when it's ready.
GameStop has since changed their projected launch date for GW2 on its website to December 31st, 2012, but several outlets still show the June 26th advertisement.
So let this be a public service announcement for all of you tricked by GameStop's sales tactics. Enjoy yourselves in the stress test tomorrow, and we'll look for that real launch date announcement from ArenaNet hopefully coming soon!