Xu Zhiqiang became the 2nd citizen journalist  for Ohmynews from China. He writes an introduction of how he gets involved, but he does not think that Ohmynews will be that successful as it is in Korea.
As far as the media situation in China is concerned, news content and publishing are strictly controlled by the government, but issuance and advertising are open to the market to some extent.
In my opinion, it will be hard for the OhmyNews model to succeed in China, because the news environment it faces is very different.
A work-around might be to focus on entertainment or sports at first.