1) Pressing the brake pedal with sufficient pressure to exceed tire limitations will activate ABS, but that will be at a braking force WELL beyond what the motor(s) will generate under typical driving conditions.
2) On very slippery surfaces where the .02-.03g of deceleration normally generated by the brakes is more than the tires can handle—I.e actual ice—the car will most likely use the brakes for stability control, rather than in an attempt to achieve additional deceleration.
3) Bottom line: drive normally, and the car will take care of you.