Works like this: As the driver starts to turn the steering wheel when entering a corner, the car's on-board computer discreetly cuts the slightest amount of engine power in a matter of milliseconds.
This has the effect of putting a fraction more weight over the front wheels. This in turn gives the front tyres (tires) slightly more grip and creates a more secure cornering feel. Mazda 3's will get it first in Aussie.
It's called G-Vectoring and new models will be fitted with it as they are updated.