Okay, coldreactive Thats some false Information there.
I Tried a few things out and read Most of the Threads and Posts from Sega since the Announcment for Xbox.
I live in germany and im playing on xbox at the moment but will switch to pc when its out
The things i Can tell so far:
First of all yes you have to Change your Region settings inside of windows and your location settings inside your Microsoft Account to US after you did this you will be able to use the US Store on your PC. There will be no way to download the game inside european Stores. Its Important to change both and to Restart your Pc After That, otherwise you will be still at your old Regional store.
Second, you can buy USD Xbox gift Cards from any online Store and Use them on the Microsoft us store Even to buy things in pso2(testet that many times xD)(North American or United States Gift Cards, Dont know why their These two different ones, but i testet Both and both work Fine)
But the sad truth is That for Now there is no Real announcment for a Real global realese....
But you can Play With no real downsides on the US Servers and the Region Changes do Not affect your already bought software or games bought on your Microsoft Account and Not Even Other Games On Steam, Battlenet, Epic Launcher or Uplay, as far as i Can Tell.