Cataclysm Beta Opt-In

Get those opt-ins ready for the World of Warcraft: Cataclysm closed beta! The sundering of Azeroth is nigh, and you don’t want to be left out in the cold of Northrend when you could be enjoying the sun-drenched beaches on the goblin isle of Kezan. To ensure you’re opted-in and eligible as a potential candidate, you’ll need a World of Warcraft license attached to your Battle.net account, have your current system specifications uploaded to the Battle.net Beta Profile Settings page, and have expressed interest through the franchise-specific check boxes.

So get your opt-ins set up, updated, and ready; we’re worgen real hard to get the beta going soon!

https://eu.battle.net/account/management/beta-profile.html

Q u o t e:
https://eu.battle.net/account/management/beta-profile.xml

If it shows you error than just copy the link and overwrite .xml to .html
so https://eu.battle.net/account/management/beta-profile.html this should work

Yep it seems the web page's extension changed. We've now updated the original post to point to:
https://eu.battle.net/account/management/beta-profile.html