World in Conflict was one of the very best games on the PC last year, offering a thrilling real-time strategy experience that featured no base building or resource gathering. Instead, it focused on nothing but white-knuckle modern warfare as you used planes, artillery, tanks, infantry, and more to crush the enemy and crater the battlefield. Now if you make a really great RTS game, it almost goes without saying that the next thing you'll make is an expansion pack. That's what almost everybody does. But IGN caught up with Magnus Jansen, the lead designer of World in Conflict, and he told IGN that is most definitely not the case with Soviet Assault.