No change today Ozzie.... the higher performance wings (single surface adn novie intermediate wings don't bother generally) still use VB or as it is called now VG 'Variable Geometry'. The cross bar which joins in the middle via ball joint or plates is pulled back, pushing out (forward) at the leading edge/x bar junction, changing nose angle and tightening the wings, More stable in roll (and harder to turn or correct non-pilot induced turns) but less pitch stable due to reduced washout and nose angle. Less drag means better glide and at higher speeds.