The make’s smallest rear-drive passenger road car goes big on S-Class tech.

WHAT derivatives are coming, when do they arrive and, of course, how much will they cost?

Sorry, it’s premature asking those questions yet in respect to the all-new 'W206' Mercedes-Benz C-Class.

The car’s official international uncovering has only occurred today, so Mercedes’ New Zealand distributor says answers to any questions in respect to the local lineup will have to wait until much closer to the car’s release here. Which will occur late this year.

For now, then, it’s all big picture stuff – and that, alone, is quite a story in itself.

Suffice to say, the German company's latest compact executive car, so far revealed in mainstream sedan and wagon formats (as per tradition – the coupe, convertible, crossover and AMG editions of everything will follow in due course) is pukka premium in more than just presentation, pedigree and pricing.

This fifth generation family also channels much of the look and technological content of the make’s flagship S-Class uber-sedan and has an entirely electrified range of drivetrains from the get-go.

Yes, it’s bigger. The wheelbase has gone up 25mm to 2865mm in total on both body styles, resulting in a sedan that is 65mm longer (4751mm) than its four-door forebear and a wagon that's 49mm longer (also 4751mm).

The car’s 10mm wider in the body and 13mm wider across the mirrors, while their track widths have increased, too. Both shapes are slightly lower than the previous versions, with reward in improved drag coefficients (0.24 sedan, 0.27 wagon).

The general shape is sort of C-generic but it’s quite different to what we get now, with a swoopy air abetted by short overhangs, a long wheelbase and a cab-rearward design.

All models roll on alloy wheels of between 17 and 19 inches in diameter. The radiator grille design varies depending on the trim grade. Base cars have a large three-pointed star and louvre details, higher-spec editions – including AMG Line models – achieve a star-design chrome pattern. The headlamps are all new as are the tail-lights. Three new colours - Spectral Blue, High-Tech Silver and Opalite White – join the C's colour palette.

The dimensional changes reward occupants. Both seat rows have more headroom, legroom, elbow-room and shoulder-room. The wagon gains 30 litres more luggage space; there’s 490 litres capacity with all seats in play and 1510 litres with everything folded. The sedan’s boot retains the same 455 litres’ capacity as the current car.

But roominess will be less of a focus than the tech. This C-Class enters the heavily digital age with its boots on … there’s a a TFT instrument cluster (minimum 10.25 inches across the diagonal, with the option to upgrade to a 12.3-inch unit) and a large infotainment screen reclining on the centre stack, this being at least 9.5 inches, or 11.9 as an option.

The dashboard design lends to an aviation theme; Benz has split it into two tiers for a wing-like formation, and the rounded air vents are said to be reminiscent of jet engines. Various leather, leatherette, wood and metal upholstery/trim choices are available, a colour head-up display is an optional extra and the connectivity of the car is boosted with several software packages plus over-the-air technical updates.

Under the bonnet? As expected, four-cylinder, mild-hybrid turbocharged drivetrains pervade; performance pep is important, but this is Benz driving into an eco future. An integrated starter-generator (ISG), running off a 48-volt electrical system, is a standard ingredient to provide 'gliding' when off the throttle, power-assistance under acceleration and energy recovery too, all to save some fuel. There's also Mercedes' EQ Boost, which adds 15kW power and 200Nm.

NZ will presumably only have eyes for the petrols, which start with a 1.5-litre in the C180, this engine making 126kW and 250Nm from the engine, plus the EQ Boost involvement, which can do 0-100kmh in 8.6 seconds.

The C200 also uses a 1.5-litre engine and it has 152kW/300Nm before EQ Boost, resulting in a 0-100kmh time of 7.3 seconds. The C300 is a 2.0-litre unit with the same EQ Boost function, adding to the engine's 192kW and 400Nm for a six second 0-100kmh run and 250kmh top speed.

Fuel economy and emissions counts figures will be shared once the cars’ WLTP homologation is completed.

If mild hybrid doesn’t seem good enough, don’t worry. Mercedes also has a plug-in hybrid model in the pipeline. This pairs a 95kW electric motor to a 152kW 2.0-litre petrol engine for system outputs of 233kW and 550Nm, along with up to 100km of all-electric driving range, courtesy of a 25.4kWh lithium-ion battery pack, at 100kmh, or higher.

The nine-speed automatic gearbox is carried over, but now calibrated to work with the ISG. Everything is rear-drive, of course, but  4Matic all-wheel drive is an option on some models in some markets.

The chassis is a development of the current underpinning, but with a new four-link front axle and a multilink rear end that's mounted to a subframe form a suspension set-up that is said to provide a good blend of agility, comfort and fun. Optional adjustable damping, a Sport specification and even air suspension on the rear axle of the plug-in hybrids will all be offered, as will rear-wheel steering.

There’s a massive array of advanced driver assist safety systems and it achieves the schmanzy digital light headlamp technology from the S-Class, in which the light from three powerful LEDs in each cluster is refracted and directed by 1.3 million micro-mirrors, resulting in a resolution of 2.6 million pixels per vehicle.