So far the Virushi haven't appeared. In the meantime if you have the CT Contact article you can use it straight. The GURPS version uses most of the same text.
Considering the level Mongoose alien books have been written to, both the Hivers and K'kree are not easy projects. I'm curious if all the interest is practical, by people who want to play in those regions, or academic, by people wanting to see progress on setting books ("ANY setting books!").