Twitter has coincidentally scheduled a pair of "Developer Teatimes" for October 10th and October 12th. The meetings will focus heavily on Twitter's integration with iOS 5 — a feature that was announced by Apple at WWDC this past Summer.
Apple has also told its AppleCare division to expect a high influx of iOS 5-related questions on October 10th. Employee vacation blackouts have also been put in place for the 2nd week of October. Do we finally have our iOS 5 release date?