We got this email ourselves - promising a slot in the Wrath of the Lich King Beta - so we wanted to warn the community. There's currently a fake "Wrath of the Lich King Beta" invite going around. DO NOT CLICK ON THE LINKS WITHIN THE EMAIL.
Blizzard will no doubt announce the beta prior to it beginning, so we here at Curse urge you to be very careful when clicking links from emails that "appear" to be related to World of Warcraft.
If you do happen to click the link, please make sure to run a system scan for possible keyloggers, and never provide your account information unless you are logging in to a worldofwarcraft.com URL.