Porsche will launch its next-generation Cayman next year and has revealed the model at the LA Motor Show.

Essentially a Boxster coupe for sub-911 customers, the new Cayman is wider, lower and has a stretched wheelbase by 60mm – which is now even longer than the 911, to the benefit of interior space. Weight has been reduced by 20kg.

The roofline 9 inches longer and higher, the wheelarches blistered front and back and the rear is distinguished by a full-width spoiler skewering the rear lamps.

The Cayman will come with a choice of a 2.7-litre 271bhp or 3.4-litre 321bhp from launch. PDK twin-clutch transmissions are available on either model in place of the six-speed manual, and a raft of new tech – much of it imported from the latest 991-spec 911 – is now available. There's active cruise control, electro-mechanical power steering and a decouple-to-coast function claimed to save a litre of fuel every 62 miles.

Porsche has added a modest £487 premium to the cost of a base Cayman, which will be priced from £39,694 when sales begin in spring 2013.