That's right Cataclysm Beta is coming and to prove it Blizzard have officially reminded us to set out Op-In setting in account management. Just go to this link and follow the steps from there. Blizzard are getting technical with one requirement of the Beta Op-In that you download and run a Battle.Net systems checker. It seems that Op-Ins will be given based on computer specs not just a luck of the draw. Mines in now so all that's left to do is cross my fingers and wait, hopefully we wont be waiting long.