Right now there is no WotLK beta, there is no chance you'll get in the alpha if you're not already in it, and there is no email that's going to be coming to your inbox anytime soon about it. But when it comes, it's going to make you one happy gamer. This is a very important thing for people to understand, especially with the flood of fake emails lately.
Blizzard will make an announcement on their forums and/or their homepage letting all of us know that WotLK beta invites are going out. The email that you'll get if you're lucky enough to get invited will be sent from an @blizzard.com address, will come through the blizzard.com servers (you can check the extended email headers in your email program to see this). The email will have tons of identifiable information in it that only points to blizzard.com or worldofwarcraft.com and nowhere else.
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