No idea. To add a new translator, Google needs two things: large
amounts of aligned, parallel translations (such as UN documents
translated into umpteen languages) and huge amounts of single-language
sample text.
I suppose they mine the sample text from the web and their scanning
efforts, but this would yield far less for Latin than most (all?)
languages currently in the translator. This is one reason I don't
expect to see many minor African languages in GT anytime soon: too
little active net presence.
Parallel text is the limiting factor for most of their translation
efforts (or at least that's how I interpret their requests for it in
the FAQ). For Latin, only historical texts like the Bible, Euclid's
elements etc. are readily available in parallel translations. The only
ones I know of currently publishing the same documents in multiple
languages that include Latin, is the Catholic church. And even they
seem to mostly do it for major publications like encyclicals.
