Following in the footsteps of their Sedan sibling, the svelte 3-series Coupe and Convertible are also due for a mid-cycle facelift towards the end of the year or early next. Today we have a computer generated rendering for the updated Coupe, previewing the new two-door ahead of its expected unveiling at either December’s 2009 Los Angeles Auto Show or January’s 2010 Detroit Auto Show.

Like the facelifted Sedan, which was launched late last year, changes to the Coupe and Convertible should incorporate sportier styling, reworked head and tail-lamps, and possibly a wider track.

The interior will get a new look as well, with improved trim, a new center armrest and a second-generation iDrive system with four selector buttons for commonly used features such as the stereo. The iDrive system will also sport a new 8.8 inch LCD display and an optional 80 Gb hard drive music and navigation system.

Mechanical updates introduced in the facelifted Sedan, which should also make their way into the two-door models include a brake energy regeneration system, an autonomous engine stop-start function, electro-mechanical power steering and tires with reduced rolling resistance.