User blog comment:Turkeysocks/ESO Beta test starts 6:00 pm EST on Jan 10th to midnight on Jan 12th/@comment-5558140-20140114004341/@comment-1822253-20140114011449

Well, the beta ended at 11:59 pm yesterday, Jan. 12th. But, if you had been invited to the beta previously, then your beta key should be the same one they sent you previously. So you just need to log in.