After a successful 2010 and a plan that will see Cadillac introduce two volume luxury models, GM's luxury brand is currently studying a total of seven proposals for new vehicles in niche segments.

Once the XTS full-sized luxury sedan and ATS BMW 3 Series fighter debut, Cadillac will be competing in roughly 90 percent of the luxury market and will look to grow into new segment.

Proposals include a list of unconventional vehicles that range from a MINI Cooper Rival to an SUV based on the same platform as the Chevrolet Traverse. That later is reportedly the most likely. Other vehicles being studied include a compact crossover, not to mention a coupe-styled sedan.

Through 2010 Cadillac sold 146,925 vehicles, ranking behind Mercedes-Benz, Audi, BMW and industry leader Lexus, all of which have significantly more models to choose from in their showrooms.

More: Cadillac Considering 7 New Models in Niche Segments on AutoGuide.com