1 min ago on Twitter..
ETA:Guild Wars 2 @GuildWars2 Close
We've started sending out emails with instructions for where/how to download the Beta client. Thanks for your patience; happy patching! ^MK
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Sending out all the mails will take some time - no panic if you did not get a mail immediately. ^MK
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We are working on the 502 error. Your eagerness was a bit too much it seems. :P ^MK