Just before on Twitter announced roadmap for the First World War Z with upcoming DLC content has been released, developers are now announcing (also via Twitter) a new mission and another special zombie.
The new mission continues the Tokyo campaign, which starts with only two missions (the other locations in New York, Moscow and Israel begin with three levels).
– World War I (@wwzthegame) April 24, 2019
According to the description, the new type of zombie must "quickly spread the virus and infect the new hosts with it." He is not only present in the new mission but also in other scenarios. DLC with a new special zombie and the mission appears in May as a free update World War Z.