See link below to article:
"With each new Hummer model being more successful than the last, General Motors officials aren’t likely to stop expanding the brand soon.
Plans are under way for the H4, which is expected to be a strong competitor for Jeep’s off-road icon, the Wrangler. H4 plans call for a smaller hard-core off-roader. At present GM has not identified which GM chassis will be the donor or which engine will get the call, but the five-cylinder from the H3 is a likely candidate. Robert Lutz, the vice president in charge of products, is rumored to be a strong supporter of the new H4. Lutz is the former head of Jeep, so he should know how to compete against it.
Further down the road, there will likely be a softer side of Hummer for buyers who don’t want to just climb a mountain but are more comfortable scaling a parking ramp at the mall."
Link