Loop Rumors, ifoAppleStore and Think Secret are all reporting that Leopard will hit shop shelves at 6PM on October 26th, this is reportedly "confirmed."
AppleInsider notes that Apple is expected to make an announcement to the media as early as Tuesday 16th October.
Both AppleInsider and Mac Rumors still insist that no Gold Master has been confirmed even though a GM candidate was released internally last Friday. This build is widely expected to go GM imminently.