A few days ago China Daily reported that the Yinghuo-1 prototype is currently undergoing tests. Yinghuo-1 is China's small, 110 kg Mars probe, that will travel to Mars on the back of the Russian Fobos-Grunt mission, to be launched in 2009. Mars orbit insertion will also be performed by the Fobos-Grunt spacecraft, before their separation. The compatibility of the two spacecraft will be tested next spring.
The following presentation contains most of what's currently known about Yinghuo-1.