actually, this is what the real speculation of the release date is (according to kh.co.uk):

As revealed by Tetsuya Nomura, we recently learnt that Kingdom Hearts 2 will come out after the release of FFVII: Advent Children and within this year (2005). Yesterday the release date for the movie was confirmed to be September 14th.
This means that Kingdom Hearts 2 now has a projected release date to come out anywhere between September to December, in Japan. But it is most likely to see a release this October as it will fit in the "one big product a month" scheme S-E are doing. We do not currently know if Kingdom Hearts 2 will hit American shores this year, but its still expected to as the localization process has begun (English VA's).

So, FFVII:AC is going to be released Sept. 14, so that means, assuming that they will go on with their promise of a product a month, it will come out either Oct, Nov, or Dec.