First, the rumors contended that October 15th was the date that we would see the Nexus 5 and Android 4.4 being released. Then there was a fairly thinly connected rumor that the date will actually be October 28th (which it very well may be). But, there was another theory that the KitKat clues may have been pointing towards Monday October 21st, but that theory has hit a dead end...
Source: http://www.phonearena.com/news/Android-4.4-October-21st-clues-hit-a-dead-end_id48458
Source: http://www.phonearena.com/news/Android-4.4-October-21st-clues-hit-a-dead-end_id48458