DVDcraze (Australia) is also reporting the December 6th date, further evidence that places are converging on a single release date-- that may of course still not be the true release date!
http://www.dvdcrave.com/products/product.jsp?pid=36442
I can't help but think that Sony wants this game out before Christmas holidays given the inevitable and absurd spike that videogame sales receive this time of year.
Ah, if only videogame sales were more constant year-round-- imagine the benefits that gamers would have. No more rush-rush to release in the October-December window, no more "batching" of release dates so gamers must endure the spring and summer droughts.
Ok, end rant