We have an ever growing list of languages in WiktionaryZ. There are always good reasons why we add a specific language; it has a nice script or there is someone interested in adding content or we have a potential partner with an interest in THAT language.
It was suggested to me to have Latin. The motivation was; I have this list of birds and would it not make sense.. It does make sense on one level and, on another it does not. The Latin used to come up with all these taxonomical names is not necessarily the kind of Latin that helps you learn the language.
When we want to include THAT kind of Latin, it makes sense to include the taxonomical relations and attributes that makes taxonomy the science that it is. Considering this, it will need Wikiauthors for it's publication data. It will need some specific database functionality to make this feasible..
I do want Latin but I doubt if this is a good moment to include it.