Players are getting scam emails after the Beta Opt-In registration from a phishing website that makes it look like Blizzard has sent emails. These emails are fake and wish to steal your account information. Do not click any links in the email you receive. Always check out the front page of Blizzard.com and Worldofwarcraft.com for any news about closed beta. Blizzard employees will never ask for your account password. (Source)
Slorkuz: The email that you received and depicted in that screenshot is a fake/scam.
This is a ‘phishing’ website, pretending to be a Blizzard site asking for your username and password for “log in purposes”. Instead, upon entering your information here, it will save the information and give it to the creators of the fake website, granting them access to your account.
Please be sure to note that we have not started the Wrath of the Lich King beta program for public play, only the opt-in for a chance of winning access to the upcoming beta. More information about this opt-in can be found here: http://forums.wow-europe.com/thread.html?topicId=4754136099&sid=1