Of course, he hasn't confirmed it, either. Ever since that German CM apparently hinted at a July 3rd start date for the WoTLK Beta at the Worldwide Invitational, people have been searching for further confirmation or denial of the rumor. Bornakk, in true Blizzard style, has been staying mum, saying only that a date for the beta test has yet to be announced.
When someone expressed fear that we'd only hear about the beta at Blizzcon, Bornakk assured them that Blizzcon is not the only place to release information, but reiterated that there's no actual start date for the beta announced yet. On a later thread, when someone said that the WoTLK Beta would start this week, he linked back to that same thread, once again not outright denying it, but saying only that it had not yet been announced.
So what does this mean, exactly?