Activision officially revealed Modern Warfare 4 today, and we learned several new details about what to expect for a new year of Call of Duty, including a promising new change for how players progress in multiplayer. Modern Warfare 4 arrives on October 23, featuring campaign, multiplayer, and the return of DMZ. While we don’t have the full details of how progression will work, or if it will be available across all modes, we did learn that Modern Warfare 4 will…