In Australia we are ahead of America and we get halo 4 about 16 hours earlier!! Does this mean we have to wait an extra day to play the game or we can play it as soon as we get it?
Soon as you see halo 4 in stores, you can purchase it and go home play it! Where i am, i get halo 4 8 hours before US does.
It should be save to play from on Monday. No official source will ban someone because he could play it a day before official release. All the times games are released and played 1 or 2 days before release date. You should be safe.