Sleeping Dogs is an open world action-adventure video game developed by United Front Games. In Sleeping Dogs, you play as an undercover cop named Wei Shen, who also has ties to the triad. Players follow Wei on a mission to help bring down the Triad, but more especially the Sun On Yee. Sleeping Dogs was set in Hong Kong. Sleeping Dogs released on PS3 on August 14, 2012 in North America and August 17, 2012 in Europe.
Today United Front Games games confirmed some huge news regarding Sleeping Dogs. A couple of months ago many of you may have remembered a trademark titled "Triad Wars." Today UFG has announced that they are working on Triad Wars as their next project and that it is set in the Sleeping Dogs Universe. They won't be revealing more about this project this year though, but will touch up on it more in 2014.
Source: UFG Blog.