Citroen has released first details of the forthcoming Citroen DS4 , the second model in the upmarket DS series of cars.TheCitroen DS4 is larger than the DS3 model, more akin to a 5-door hatchback with a coupé-like body.All engines deliver powerful and efficient performance, including the new to Citroen 200hp petrol unit.The 5-door ‘crossover coupe’ family hatch is the latest variant in the ‘posh