Big games like this one usually have to go through a lot of translation and adding of features. Since this will be a bigtime game and not a half-a$$ racing game, you can surely expect that not just some of us Americans will want GT4, but also others around the world. Many of you are not from America, so you all may get the game in your native language.
So to response to "GT4 needs to stop delaying," I'll say it like this: PD is trying as hard and as fast as they can to get the game to be as perfect as possible. When the game is at its highest quality, other game makers will try to better GT4. Why? Because Gran Turismo helped define and enhance the racing game. When you can create and enhance a genre of any kind, you are bound to competition. The one-up game plays into full effect. Either companies will try to take elements from GT4 and make their own game. Some might even have options and menus that look like GT4, but a totally different game.
So in other words, and I hate to admit this, but it's true... whatever it takes for Polyphony Digital and Kazunori Yamauchi to get GT4 to be more than a hit game, they'll leave no stone unturned. Whatever they come up with, you have to applaud their efforts. Even if the game comes out in February 27th 2005, we just have to wait. (Maybe PD is looking at this site and gathering ideas).