The compact family hatchback has a new exterior design, new cockpit-style cabin, better build quality and a range of very efficient petrol and diesel engines.
The new Peugeot 308 is a car that will revitalise the brand's position in the ultra-competitive, compact family hatchback segment.
Its world debut is planned for the Frankfurt Motor Show in September.
The 308 is 4.25 metres long and features a new front end dominated by an evolution of the brand's signature 'floating' front grille.
Slim, full-LED headlamps are standard on the majority of trim levels.
Three lion-claw LED lamps are housed at the rear.
The new Peugeot 308 is the latest evidence of the brand's move up-market, an initiative started several years ago and seen most recently with the new 208.
Peugeot's design and engineering teams have developed the interior of the new 308 around the concept of an i-cockpit.
Everything Peugeot says is arranged for an experience that is intuitive, to allow the driver to focus entirely on the road ahead.
The compact steering wheel and head-up instrument layout mean that information can be clearly read easily and safely, looking over rather than through the wheel.
The highlight of the new 308's cabin is the 9.7-inch touch-screen interface, which removes much of the need for physical buttons and switches.
"When inside the car, one discovers a world of refined style, completely original in the world of hatchback cars, with a cockpit that is intense, innovative and intuitive; it is the Peugeot i-cockpit," said Vincent Devos, New 308 Product Manager, Peugeot.
The new Peugeot 308 will be built at the Sochaux plant in France.
The Trémery and Douvrin sites will supply all of the power units.
Development of the new Peugeot 308 has seen 116 patent applications.
308 goes on sale in Ireland from January 2014.