Supposedly, according to a report at Reuters, a Samsung rep has confirmed that the Galaxy Note 2 will be unveiled at IFA 2012 on August 29th. We have heard this rumor for weeks now, and this seems to be the most official confirmation we could receive on the subject. Samsung will be having a Mobile Unpacked Event on August 29th just before the IFA 2012 conference in Berlin. This is where and when they will announce the phone. Here's the quote from the Sammy spokesperson,

"We plan to unveil the next Galaxy Note at the Samsung Mobile Unpacked event in Berlin on August 29."
That seems pretty straightforward. I guess we will know in about a month.

Source: Reuters