http://www.mcvuk.com/news/39797/Final-Fantasy-XIV-dated
Additionally, I just got the following email from Amazon, which has the game listed for September 23, 2010:
Dear Amazon.com Customer,
As someone who has purchased Final Fantasy products or MMO role-playing games at Amazon.com, you might like to know that you can now order the Final Fantasy XIV Collector's Edition for the PC and play it on day one (and a full six days before the standard edition is released) with Release-Date Delivery.
Edit 2: More confirmation. http://twitter.com/SquareEnixPress
Edit 3: http://www.gamespot.com/news/6267534.html?tag=result;title;0
Edit 4: http://www.ffxivcore.com/topic/7178-ffxiv-to-be-released-on-september-30th-2010/?s=cf6435435a57f546ddd6721b13cbe5a6