BMW will reportedly showcase updated versions of its 3-Series coupe and convertible models at next week's North American International Auto Show in Detroit. The updates will include styling tweaks as well as a new trim level.

According to the enthusiast site Bimmer File, the new models will feature a revised front fascia, complete with new bumpers and LED headlight treatments. A few tweaks are also expected to the rear of the 3-Series coupe and convertible models.

335i model equipped with BMW's M-Sport Package or Sport Package will see a wheel upgrade, going from the current 18-inchers to new 19-inch rollers.

Additionally, BMW will introduce a new "?iS' model for the United States market for the 2011 model year. The sportier iS model will feature the choice of a DCT or Sport Automatic transmission and will boast improved aerodynamics. The iS model will also include so M Sport items. All 335i models are also in line for a power boost.

Check back for the latest details and images during next week's Detroit show.