Among the many showstoppers General Motors has planned for the North American International Auto Show in January, its military-inspired off-road brand HUMMER will be unveiling an H4 concept. The oft rumored H4 will be smaller than the successful H3 SUV that's currently driving HUMMER sales and will be slated to compete with the Jeep Wrangler. While the H3 is built on the same platform as the Chevy Colorado and GMC Canyon mid-size pickups, we don't yet know what will underpin the H3. AutoWeek sources confirm, however, that it will not be built on a front-wheel drive platform. With the success of the H3 worldwide continuing unabated despite the fluctuation of fuel prices, the decision to produce the H4 concept should be an easy one for General Motors. Expect a version suitable for mass market consumption around 2010. HUMMER will also have a pickup version of the H3 on display at the Detroit show. With two new potential vehicles on deck, HUMMER appears ready to carve as large a niche for itself as possible out of the remaining pool of off-road warriors.