I don't have any details reg. that issue but from my point of view they will utilize a - probably hydraulic - device to alter the force of tension and therefore characteristic of the anti-roll bar (call it "Stabilisator" in German or "antiroulis" in French).

As on other offorad vehicles, you want a rather high amount of twist on one axle to provide contact to the ground even in severe offroad circumstances. On the other hand, this would provide not enough stability on the road, where the chassis would lean to the outer side of the corner. To counteract this movement, the anti-roll bars have to be much stiffer. Generally speaking, the stiffer the bars, the less you will experience body roll.

Another way to look at this subject is the fact, that you can manually adjust this device on racecars to change the handling characteristics. In this case, it affects longitudinal chassis movement and response on steering inputs. By altering the anti-roll bars you can adjust turn-in and provide a notion of under- or oversteer.