The Korean manufacturer says the D-segment concept is the 11th model to be created by its European design studio in Frankfurt, and offers "confident, powerful lines". The concept also uses Kia's 'tiger nose' grille design.
Kia says the concept has been created "as a spacious and versatile accessory to an active lifestyle, as a purposeful, energetic design study for the style-conscious, and as a sanctuary from the stresses of the modern world".
Rumours that Kia will introduce its fourth-generation Optima at the Geneva motor show have been around for some time. The Volkswagen Passat and Ford Mondeo rival has already been spotted in late-stage prototype form, and is based on the same platform as the Hyundai Sonata.
The new Optima is due to go on sale at the end of this year and should be offered in Europe in both diesel and diesel-electric forms. Kia previewed a diesel-electric Optima with its T-Hybrid concept at the Paris motor show last year.