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I created a new Battle.net account, but I'm unable to opt in. Why?
In order for a Battle.net account to be able to opt in to upcoming beta tests, you must have at least one Blizzard Entertainment game attached to the account. Please note that the World of Warcraft trial edition does not count toward this requirement.

Так что сразу всем халявщикам скажу: триалка не считается, бегите в Ашаны и покупайте диски.