Infiniti will show off refreshed versions of its largest models today at the New York International Auto Show, revealing the ’15 Q70 (M) sedan and QX80 SUV.

The current-generation M and QX80, called the QX56 at its launch, went on sale in the U.S. in March 2010 and July 2010, respectively.

Both models receive freshened exterior styling and a variety of driver-assist technologies, while the Q70 adds a new long-wheelbase model.

“We know our customers desire more choice and prestige (and) the long wheelbase Q70 is our offer to them,” Vincent Gillet, vice president-marketing for Infiniti, says in a statement.

Infiniti calls the Q70’s design more dramatic and upscale than before. Changed elements include the car’s grille, now boasting a more 3-D look; a wave-like bodyline that flows from the grille to the new LED combination lights in the rear; a flatter trunk lid; and slimmer rear bumper.

The Q70 Sport model gets a unique front bumper for a lower, wider appearance and a rear bumper finished in glossy black paint near the bottom.

The Q70 continues to offer wood and leather trim inside, as well as such creature comforts as a 7-in. (18-cm) display screen and 10-way heated driver and front-passenger seats.

The LWB model’s rear legroom climbs 5.9 ins. (15 cm) over that of the standard Q70. Heated rear seats, rear reading lights and a 12V outlet also can be had in this variant of the car.

Efforts to reduce cabin noise are made for ’15, with more insulation and sealing added and wheels stiffened.

The Q70 retains the M’s array of powertrains: a 3.7L V-6 engine, a 5.6L V-8 engine and a hybrid propulsion system.

Peak output for the 3.7L and 5.6L goes unchanged at 330 hp/270 lb.-ft. (366 Nm) of torque and 420 hp/417 lb.-ft. (565 Nm) respectively. The new LWB model uses the 5.6L and sees a slight reduction in output, to 416 hp/414 lb.-ft. (561 Nm).

The hybrid system, a 2012 Ward’s 10 Best Engines winner, combines a 3.5L V-6 engine, 50-kW (67-hp) electric motor and a lithium-ion battery pack, for a still-hefty 360 hp.

Tweaked shock absorbers minimize vibrations on uneven roads, as well as reduce “shaking and bobbing.”

The Q70 improves upon the M’s safety features by adding predictive forward-collision warning, around-view monitor, backup-collision intervention and forward emergency braking.