The 2014 Mercedes S-Class has been spied virtually undisguised ahead of its official unveiling on May 15th.

While we already seen the model uncamouflaged during a photo shoot, the latest pictures give us another glimpse at the redesigned flagship which will go on sale in September.

Sporting an evolutionary design, the 2014 S-Class has a conservative appearance which clearly echoes its predecessor. Notable changes include a rounded grille, LED-infused headlights and a sportier front bumper. We can also see a distinctive rear end with LED taillights.

Since the model will have to fill the gap left by Maybach, the S-Class will move upmarket and adopt a stylish interior with higher quality materials. Highlights are slated to include a panoramic sunroof, illuminated door sill plates, soft-closing doors and LED ambient lighting. We can also expect a Burmester audio system, two 12.3-inch displays and between four different wood trims: Burl Walnut, Myrtle Sunburst, Black Popular and "Metalized Ash."

Well-heeled buyers will also be able to order options such as heated / ventilated seats, a rear seat entertainment system and an "Air Balance Package" that filters and ionizes the air and can even dispense perfume. If that's not impressive enough, consumers can order rear "Chauffer Seats" that are ten-way adjustable and have a power-deployable footrest. The car can also be equipped with Maybach-inspired tray tables that are deployed from the rear center console.

Engine options are expected to include the usual suspects so look for a twin-turbo 4.6-liter V8, a twin-turbo 5.5-liter V8 and a V12. Diesel, hybrid and plug-in hybrid variants are also in the cards but we should learn more when the model is officially introduced in the next few weeks.