Alright, Hummer was owned by GM who declared bankruptcy 2009. They soon after sold the company to a Chinese company Sichuan Tengzhong Heavy Industrial Machinery Company Ltd., which fell through several months later and is still owned by General Motors. The Hummer HX was a concept car designed from 2004-2008, that was supposed to go into production and to be released in late 2010. But production was canceled after the bankruptcy and it's never been seen from again.
Very sad, I actually liked the look of this beast, wouldn't mind having one myself!