Fisker has officially unveiled their new mid-size sedan, the Altantic, at a special event organized in advance of the 2012 New York Auto Show.
Referred to as a design prototype, the Atlantic represents Fisker’s first step "in its transition from start-up automaker to mainstream American manufacturer", but once it will enter the market, this four-door luxury sports sedan will be aimed at "young families who want to drive an impactful, high-end vehicle while making a positive statement about responsibilities". 
Just like the Karma, the Atlantic is a electric car with extended-range freedom which in this case uses a 2.0-liter turbocharged 4-cylinder gasoline unit from BMW in connection with electric motors and lithium-ion batteries that will will allow it to ride in electric or gasoline driving modes and sustain the charge of its batteries on the move.
The Atlantic’s powertrain will be configured for rear-whee drive as standard, bu an all-wheel drive version will also be offered as on option.
In terms of style the new Fisker Atlantic resembles with the Karma, but is more compact and it features a ‘spider’ structure glass roof, a coupe-like stance that allows a decent amount of rear headroom, a a wider sculpted line defining the power dome on the hood, door handles that are integrated in the rear C-pillars, slim LED tail lamps and a sharp spoiler lip on the trunk. 

Fisker claims that the Atlantic is comparable in size with the Audi A5 but it did not mention the car’s exact dimensions.
Henrik Fisker, co-founder, Executive Chairman, and Design Director of Fisker Automotive said that "We are exceptionally proud of the Atlantic design prototype, and believe
we have created another groundbreaking car that looks and will drive
like nothing else on the road in this class," "We have a long way to go, but in the near future Fisker intends to
deliver this exceptional American-designed, engineered, and manufactured
vehicle to showrooms worldwide."
Additional info such as pricing details and an on-sale date will be mentioned as we get closer to the launch of the production car.
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Source: Fisker