It's been a long wait with multiple setbacks and engine changes along the way, but earlier this year Square Enix announced that Final Fantasy XV is launching on September 30th. Unfortunately, it appears that a delay is on the way. A source within GameStop management has tipped us off that Square Enix has delayed the game until November 29th. Promotional materials with the new date have arrived at some GameStop stores with instructions that they are not to be put up until after Sunday, August 14th, so an official announcement could be coming then.
The same source that has revealed this information to Gamnesia has proven reliable on multiple occasions in the past. This includes leaking the release date and trade-in deals for New Nintendo 3DS as well as the release date for Star Wars Battlefront.
Update: A follow-up article that includes an image of GameStop's instructions for changing Final Fantasy XV's release date on promotional materials can be found here.