Sony Xperia Z1 also expected for Sept. 24th launch
We were already all but certain that the Galaxy Note 3 would make its debut at Samsung's IFA 2013 presentation, and a leaked carrier inventory system screen shows us Samsung doesn't have much longer to announce the device. The image you see above, given to Engadget, is purportedly from carrier Three UK and shows the upcoming releases for a few different devices including the Galaxy Note 3 and Sony Xperia Z1 (aka "Honami").
The Note 3 is pegged for September 16th, with the Xperia Z1 coming right after on September 24th. We can't be sure that the release dates will be these exact days for all carriers and regions, but given that we dive right into IFA next week and a major UK carrier is ready to sell the phones quickly thereafter, we have to assume they'll be on sale quickly.