While Apple CEO Steve Jobs on Wednesday said that iOS 4.1 would be coming to iPhones and iPod touches this coming week, but he didn't mention a date. It seems the Apple UK's site has put up some different info that in the U.S., with their site giving an exact date: September 8.
The U.S. site continues to say "Coming Soon," but we'll assume that rather than making two mistakes (posting a date, and posting a wrong date) that the Sept. 8 is correct. It also makes sense since the new iPod touches will ship on Sept. 8, with iOS 4.1 pre-installed.
The UK site is also udated now with "Coming Soon!" message.