This is not an official confirmation. This is an accidental leak of information whose significance is not perfectly clear.
Right now the G+ team is doing a lot of listening to the users and modifying the app in accordance as they go along, but make no mistake that the true purpose of the app is to copy all of Fb's functionality, clean it up and serve it to the user in the broader context of Google's ecosystem. I wouldn't be surprised if they launched a 140-character service next week.
I am not using Buzz, so if I am wrong please correct me, but isn't it like this: Google+ -> You opt in your followers to hear your broadcast. Google Buzz/Twitter -> Your followers opt in to hear your broadcast.
(And then there is FB with mutual opting)
I'll cite as an example the POTUS appearance on the telly last night. As a live even it was all over Twitter, nary a mention on G+. And Facebook carried very little for me aside from announcing the event.