We've seen both dual core, and more recently, quad core Athlon II processors. Today AMD is announcing triple core Athlon II processors, along with a whole slew of low-power / energy efficient dual, triple, and quad core Athlon II chips! All these processors are priced aggressively against their Intel counterpart and should lead to some stiff competition.
http://www.extremeoverclocking.com/reviews/processors/AMD_Athlon_II_X3_435_1.html
